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C
Abdominal Conditions

Canine Heart Disease Stages and the Role of Radiographs in Long-Term Management

Canine Heart Disease Stages and the Role of Radiographs in Long-Term Management Canine heart disease stages are not just diagnostic…

C
Abdomen

Cat Linear Foreign Body: Radiographic Findings, Diagnosis, and When Surgery Is Needed

Linear foreign bodies in cats, such as string or yarn, can anchor under the tongue or in the stomach and…

M

Mitral valve disease

Home | Veterinary Glossary | Mitral valve disease

D

Dilated cardiomyopathy

Home | Veterinary Glossary | Dilated cardiomyopathy

P

Pericardial effusion

Home | Veterinary Glossary | Pericardial effusion

P

Pulmonary Venous Congestion

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G

Globoid heart

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E

Echocardiography

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I

Intervertebral Disc Disease

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S

Spinal cord

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N

Nerve root

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H

Hansen Type I

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H

Hansen Type II

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C

Chondrodystrophic breeds

Home | Veterinary Glossary | Chondrodystrophic breeds

N

Neurologic Grading

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N

Neurologic Grade I

Home | Veterinary Glossary | Neurologic Grade I

N

Neurologic Grade II

Home | Veterinary Glossary | Neurologic Grade II

N

Neurologic Grade III

Home | Veterinary Glossary | Neurologic Grade III

N

Neurologic Grade IV

Home | Veterinary Glossary | Neurologic Grade IV

N

Neurologic Grade V

Home | Veterinary Glossary | Neurologic Grade V

T
Oncology

Thyroid carcinoma

A malignant tumor of the thyroid gland, often seen in older dogs. It may be functional (hormone-producing) or nonfunctional and…

M
Cardiac

Miliary nodular patterns

A radiographic pattern characterized by numerous, very small (1–3 mm), uniformly distributed nodules throughout the lungs, often associated with metastatic…

D
Cardiac

Diffuse nodular pattern

A lung pattern showing multiple nodules of varying sizes scattered throughout the pulmonary tissue, typically indicating metastasis, fungal infection, or…

D
Cardiac

Diffuse nodular-interstitial pattern

A combination of nodular and interstitial lung patterns, where nodules are present along with increased background lung opacity, suggesting widespread…

S
Cardiac

Solitary Pulmonary Mass

A single, well-defined mass within the lung, which may represent a primary lung tumor, abscess, granuloma, or metastatic lesion.

S
Cardiac

Structured Interstitial Pulmonary Pattern

An interstitial lung pattern where visible linear or reticular structures (e.g., thickened interlobular septa) create a more organized appearance, often…

T
Cardiac

Tracheobronchial Lymphadenopathy

Enlargement of lymph nodes located at the tracheal bifurcation and along the bronchi, commonly due to infection, inflammation, or neoplasia.

C
Equipment

CT-Guided Fine Needle Aspiration

A minimally invasive diagnostic technique where a needle is guided by computed tomography (CT) imaging to collect cells from a…

C
Oncology

Cancer staging

The process of determining the extent and spread of cancer within the body, including tumor size, lymph node involvement, and…

C
Oncology

Chemotherapy

The use of cytotoxic drugs to treat cancer, aimed at killing or inhibiting the growth of rapidly dividing cells. In…

T
Imaging Modalities

Thoracic radiograph

An X-ray image of the chest used to evaluate the heart, lungs, airways, pleura, and thoracic structures in animals.

P
Imaging Patterns

Pulmonary patterns

Classifications used to describe lung disease based on how lung tissue is affected (e.g., alveolar, interstitial, bronchial, vascular). Characteristic appearances…

P
Cardiac

Pleural disease

Conditions affecting the pleural space, such as effusion, pneumothorax, or pleuritis. Abnormalities seen in the pleural space, including fluid lines,…

L
Positioning

Left lateral view

A positioning technique where the animal lies on its left side for imaging. A projection in which the left side…

R
Positioning

Right lateral view

A positioning technique where the animal lies on its right side.

V
Positioning

VD (Ventrodorsal) or DV (Dorsoventral)

Terms describing patient positioning for chest imaging. VD: X-ray beam passes from ventral (belly) to dorsal (back); animal lies on…

P
Image Quality

Poor Thoracic Radiograph Quality

An image that is not diagnostically useful due to positioning, motion, or exposure errors. Characterized by under/overexposure, rotation, motion blur,…

A
Image Quality

Adequate Thoracic Radiograph Quality

An image suitable for accurate diagnosis of thoracic disease. Proper exposure, full inspiration, correct positioning (no rotation), and complete inclusion…

A
Anatomy

Airways

The passages that conduct air from the nose to the lungs (trachea and bronchi). Tubular structures visible when outlined by…

C
Anatomy

Carina

The anatomical point where the trachea divides into the left and right mainstem bronchi. Seen as a subtle internal landmark…

M
Anatomy

Mainstem bronchi

The primary branches of the trachea entering each lung. Visible as air-filled tubular structures extending from the carina into the…

T
Anatomy

Tracheal deviation

Abnormal displacement of the trachea due to masses, cardiac enlargement, or lung disease.

D
Anatomy

Displaced bronchi (“bow-legged cowboy”)

A descriptive sign often associated with left atrial enlargement pushing the bronchi apart. Divergence of the mainstem bronchi on a…

A
Cardiac

Atrial enlargement

Increase in size of one or both atria, commonly due to heart disease. Changes in cardiac silhouette shape and secondary…

B
Imaging Patterns

Bronchial thickening

Thickening of bronchial walls due to inflammation, infection, or chronic airway disease. Seen as “donuts” (end-on bronchi) or “tram lines”…

H

Heart Chambers

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R

Right atrium

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L

left atrium

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L

Left auricle

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R

Right ventricle

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L

Left ventricle

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A

Aortic arch

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M

Main pulmonary trunk

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C

Cardiac silhouette

Home | Veterinary Glossary | Cardiac silhouette

V

Vertebral heart score (VHS)

Home | Veterinary Glossary | Vertebral heart score (VHS)

V

Vertebral left atrial size (VLAS)

Home | Veterinary Glossary | Vertebral left atrial size (VLAS)

C

Cardiac disease

Home | Veterinary Glossary | Cardiac disease

P

Pulmonary vasculature

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C

Chamber-specific enlargement

Home | Veterinary Glossary | Chamber-specific enlargement

V
Contrast Studies

Voxel

The three-dimensional equivalent of a pixel used in CT and MRI. Each voxel represents a tiny volume of tissue and…

W
Oncology

Wall Thickening

Increased thickness of the wall of a hollow organ (e.g. bladder stomach intestine) detected on ultrasound or CT. May indicate…

W
Contrast Studies

Window Level

A CT display setting that adjusts the brightness of the image to optimize visualization of specific tissue types (e.g. bone…

W
Oncology

Window Width

A CT display setting that controls the range of density values displayed adjusting image contrast to highlight specific structures.

X
Anatomy

X-ray

Electromagnetic radiation used to create images of internal body structures based on tissue density. The most common imaging modality in…

Y
Oncology

Yelk Sign

A colloquial term sometimes used to describe a specific round lesion appearance on imaging. Not a standard medical term.

Z
Anatomy

Zoonosis

A disease transmissible between animals and humans. Not a radiology term but radiologists may note incidental findings related to zoonotic…

A
Cardiac

Abdomen

The body region between the chest and pelvis containing the stomach intestines liver kidneys spleen and other organs. Frequently imaged…

A
Oncology

Abdominal Radiograph

An X-ray image of the abdominal region used to evaluate organ size shape and position gas patterns and identify foreign…

A
Positioning

Abscess

A localized collection of pus within a tissue or organ caused by infection. On ultrasound it appears as a fluid-filled…

A
Contrast Studies

Acid-Base Balance

Not strictly a radiology term but relevant to imaging of metabolic disease. Acid-base abnormalities can affect organ appearance on imaging.

A
Image Quality

Acoustic Gel

A water-based gel applied to the skin before ultrasound to improve contact between the probe and skin eliminating air gaps…

A
Oncology

Adenocarcinoma

A type of malignant tumor arising from glandular tissue. May be detected in organs such as the lung colon kidney…

A
Image Quality

Adrenal Gland

A small gland located near each kidney. On ultrasound it can be identified and evaluated for masses (adrenal tumors) enlargement…

A
Image Quality

Air Sac

Thin-walled sacs that are part of the respiratory system in birds. Visible on avian X-rays. Disease causes increased opacity in…

A
Imaging Modalities

Alopecia

Hair loss that can sometimes be associated with endocrine disorders detectable on imaging (e.g. adrenal tumors causing Cushing's disease).

A
Oncology

Anesthesia Monitoring

The process of monitoring vital signs during imaging procedures requiring sedation or anesthesia. Important for patient safety during CT MRI…

A
Oncology

Angioma

A benign tumor made up of blood vessels. May be detected on contrast imaging as an enhancing vascular lesion.

A
Oncology

Aorta

The main artery of the body arising from the left ventricle of the heart. Visible on X-ray and CT as…

A
Oncology

Aortic Stenosis

Narrowing of the aortic valve or the outflow tract from the heart. Detected on echocardiography and may cause heart enlargement…

A
Equipment

Apex

The tip of an organ or structure such as the heart apex or lung apex. Visible on imaging and used…

A
Anatomy

Apocrine Gland Adenocarcinoma

A type of cancer arising from sweat glands in cats and dogs. May metastasize to lymph nodes and lungs visible…

A
Oncology

Appendicular Skeleton

The bones of the limbs including the front and back legs. Contrasted with the axial skeleton (spine skull ribs). Frequently…

A
Equipment

Artifact Reduction

Techniques used in imaging to minimize or eliminate artifacts that could obscure pathology or simulate disease.

A
Oncology

Aspiration Biopsy

A procedure using a needle guided by ultrasound or CT to collect cells from a mass or lesion for cytological…

A
Anatomy

Atrophic Kidney

A kidney that has shrunk from its normal size due to chronic disease. On X-ray or ultrasound the kidney appears…

P
Cardiac

Pulmonary neoplasia/cancer

Abnormal, uncontrolled growth of cells in the lungs of dogs or cats, either primary or metastatic. Presence of primary or…

C
Anatomy

CT Scan

Home | Veterinary Glossary | CT Scan Related articles Musculoskeletal Hip Dysplasia in Dogs: Radiographic Diagnosis, Clinical Signs, and Treatment…

B
Anatomy

Bronchoalveolar carcinoma

A subtype of lung adenocarcinoma characterized by tumor growth along alveolar walls without invasion of underlying structures. A pulmonary tumor…

A
Contrast Studies

Adenocarcinoma

A malignant tumor arising from glandular epithelial cells, commonly found in the peripheral lung. The most common primary lung tumor…

S
Oncology

Squamous cell carcinoma

A malignant tumor originating from squamous epithelium, usually located centrally in the lungs. Usually presenting as a central mass that…

S
Oncology

Solitary lesion

Solitary pulmonary nodule : Single round opacity, could be benign or malignant. Solitary pulmonary mass : larger than a nodule…

L
Oncology

lobulated cancer margins

Tumor borders that appear irregular and scalloped, suggesting uneven or aggressive growth.

M
Oncology

Mammary carcinoma

A malignant tumor of the mammary (breast) glands in animals, most commonly seen in unspayed female dogs and cats. It…

H
Oncology

Hemangiosarcoma

A highly malignant tumor arising from vascular endothelial cells (cells lining blood vessels). Common in dogs, especially affecting the spleen,…

M
Oncology

Melanoma

A tumor of melanocytes (pigment-producing cells). In animals, it can be benign or malignant; malignant forms are common in the…

S
Imaging Patterns

Slice Thickness

The thickness of each cross-sectional image acquired during CT or MRI scanning. Thinner slices provide more detail but increase scan…

S
Anatomy

Soft Tissue Opacity

The density seen on X-ray for soft tissues including muscle fat and fluid-filled organs. Less dense than bone but more…

S
Positioning

Sonography

Another term for ultrasound imaging. Uses high-frequency sound waves to produce real-time images of internal structures.

S
Positioning

Spatial Resolution

The ability of an imaging system to distinguish between two closely spaced objects. High spatial resolution means finer detail is…

S
Imaging Modalities

Spinal Cord Compression

Narrowing of the spinal canal causing pressure on the spinal cord. Detected with myelography MRI or CT.

S
Oncology

Spondylosis Deformans

A degenerative spinal condition in which bony bridges (osteophytes) form between vertebrae. Visible on X-ray as bone spurs along the…

S
Positioning

Stenosis

Narrowing of a passage vessel or tube. Detected on contrast studies Doppler ultrasound or CT.

S
Oncology

Stent

A small mesh tube placed inside a vessel or passage to keep it open. Visible on X-ray as a metallic…

S
Image Quality

Struvite

A type of mineral crystal that commonly forms urinary stones in dogs and cats. Struvite uroliths are visible on X-ray…

S
Imaging Patterns

Subchondral Bone

The layer of bone just beneath the cartilage in a joint. Changes in subchondral bone (sclerosis cysts) are visible on…

S
Oncology

Subluxation

Partial dislocation of a joint in which the surfaces are still partially in contact. Distinguished from full luxation on X-ray.

S
Image Quality

Superimposition

The overlapping of different anatomical structures on a 2D X-ray image making it difficult to distinguish individual structures.

S
Imaging Patterns

Synovial Fluid

The lubricating fluid inside joints. Joint effusion (excess fluid) can be detected by X-ray (joint widening) or ultrasound (visible fluid).

T
Imaging Modalities

T1-weighted Image

An MRI sequence that provides good anatomical detail. Fat appears bright and fluid appears dark.

T
Image Quality

T2-weighted Image

An MRI sequence in which fluid appears bright. Excellent for detecting edema inflammation and fluid-filled structures.

T
Oncology

Technetium-99m

The most commonly used radioactive tracer in nuclear medicine/scintigraphy. It is injected and absorbed by specific organs for imaging.

T
Oncology

Thoracentesis

A procedure in which fluid is removed from the chest cavity (pleural space) using a needle for diagnosis or treatment.…

T
Oncology

Thoracic Radiograph

An X-ray image of the chest evaluating the lungs heart great vessels and thoracic structures.

T
Contrast Studies

Thrombus

A blood clot inside a vessel. On contrast CT or Doppler ultrasound it appears as a filling defect or area…

T
Oncology

Trachea

The windpipe connecting the larynx to the bronchi. Visible on X-ray as a gas-filled tube in the neck and chest.…

T
Anatomy

Tracheal Collapse

A condition mainly seen in small breed dogs where the trachea flattens during breathing. Diagnosed with fluoroscopy or X-ray showing…

T
Oncology

Transverse Plane

A horizontal cross-section of the body. CT images are typically acquired in the transverse plane.

U
Image Quality

Ultrasonography

The use of high-frequency sound waves to create images of internal structures. Non-invasive and does not use radiation.

U
Anatomy

Umbilical Hernia

A hernia at the navel (belly button) in which abdominal contents protrude through the umbilical ring. Detected on physical exam…

U
Image Quality

Unilateral

Occurring on one side of the body only. Used to describe findings on imaging limited to one lung liver lobe…

U
Image Quality

Ureter

The tube connecting the kidney to the bladder. Normally not visible on X-ray but can be seen on contrast urograms…

U
Image Quality

Ureterolithiasis

Stones (calculi) within the ureter. Can cause obstruction and hydronephrosis. Detected on plain X-ray CT or contrast urography.

U
Contrast Studies

Urethrogram

An X-ray study of the urethra performed by injecting contrast material. Used to detect strictures tears or stones in the…

U
Anatomy

Urolith

A stone or calculus that forms within the urinary tract (kidneys ureters bladder or urethra). Detected on X-ray ultrasound or…

U
Oncology

Urogram

A generic term for an X-ray contrast study of the urinary system.

V
Anatomy

Vasculature

The network of blood vessels in the body or within an organ. Evaluated using contrast CT Doppler ultrasound or angiography.

V
Cardiac

Ventral

Toward the belly (undersurface) of the animal. A standard directional term in veterinary imaging.

V
Positioning

Ventriculomegaly

Enlargement of the ventricles of the brain detected on CT or MRI. May indicate hydrocephalus or brain atrophy.

V
Imaging Modalities

Vertebral Column

The spinal column made up of individual vertebrae encasing the spinal cord. Evaluated on X-ray for fractures luxations or degenerative…

V
Abdominal Conditions

Vertebral Heart Score

A standardized method used in veterinary radiology to measure heart size on thoracic X-rays by comparing it to vertebral length.

V
Anatomy

Vesicoureteral Reflux

Backward flow of urine from the bladder into the ureters detected on contrast imaging (cystogram/voiding cystourethrogram).

V
Anatomy

View

A specific orientation or position in which a radiographic image is taken. Multiple views are typically needed for diagnosis.

V
Oncology

Voiding Cystourethrogram

A contrast X-ray study performed while the patient urinates to evaluate the urethra and bladder for abnormalities.

P
Imaging Patterns

Parenchyma

The functional tissue of an organ (as opposed to supporting structures). On imaging changes in parenchymal pattern can indicate organ…

P
Positioning

Patellar Luxation

Dislocation of the kneecap (patella) to the inside or outside of its normal position. Diagnosed on X-ray by noting the…

P
Oncology

Pathologic Fracture

A fracture that occurs through diseased or weakened bone due to tumor infection or metabolic disease rather than from trauma.

P
Oncology

Pericardial Effusion

Accumulation of fluid around the heart within the pericardial sac. On X-ray the heart appears rounded and enlarged and on…

P
Oncology

Perineal Hernia

A hernia occurring on either side of the tail in which pelvic or abdominal contents protrude into the perineal area.…

P
Oncology

Periosteal Reaction

New bone formation on the outer surface of a bone in response to injury infection or tumor. Visible on X-ray…

P
Oncology

Peristalsis

The rhythmic muscular contraction of the intestines that moves food through the digestive tract. Can be observed during fluoroscopic contrast…

P
Oncology

Phlebography

Imaging of veins using contrast material injected into a vein.

P
Oncology

Pleurodesis

A procedure to intentionally cause the pleural layers to stick together preventing fluid or air accumulation. Not directly an imaging…

P
Equipment

Pneumonia

Infection or inflammation of the lungs causing the air spaces to fill with fluid or pus. On X-ray it appears…

P
Abdominal Conditions

Pneumoperitoneum

Free air or gas in the abdominal cavity. Detected on X-ray as a dark area under the diaphragm. Indicates perforation…

P
Anatomy

Pneumothorax

Accumulation of air in the chest cavity (pleural space) causing the lung to collapse. On X-ray the lung appears retracted…

P
Oncology

Portal Hypertension

Increased blood pressure in the portal vein system of the liver. On ultrasound the portal vein may appear enlarged and…

P
Oncology

Positron Emission Tomography

A nuclear medicine imaging technique that uses a radioactive tracer to detect metabolic activity. High metabolic areas like tumors appear…

P
Cardiac

Pseudomass

An apparent lesion on imaging that turns out to be a normal structure or artifact rather than a true pathology.

P
Abdominal Conditions

Pulmonary Edema

Accumulation of fluid in the lungs due to heart failure or other causes. On X-ray it appears as a fluffy…

P
Oncology

Pulmonary Hypertension

Elevated blood pressure in the pulmonary arteries. On X-ray the pulmonary arteries may appear enlarged and on echocardiography right heart…

P
Abdominal Conditions

Pyelogram

An X-ray image of the kidney renal pelvis and ureter after administration of contrast material.

P
Contrast Studies

Pyothorax

Accumulation of pus in the chest cavity. On X-ray it appears similar to pleural effusion and the lung is compressed.

R
Cardiac

Radiolucent

A term describing a material or structure that allows X-rays to pass through easily appearing dark on the image. Examples…

R
Cardiac

Radiopaque

A term describing a material or structure that absorbs X-rays and appears white on the image. Examples include bone calcium…

R
Abdominal Conditions

Radiopharmaceutical

A radioactive compound injected into the body for nuclear medicine imaging (scintigraphy). It accumulates in specific organs or tissues depending…

R
Cardiac

Reconstruction

The process by which a computer uses raw data from CT or MRI to create images. Different reconstruction algorithms (kernels)…

R
Abdominal Conditions

Renal Calculus

A stone or calcification within the kidney. Appears as a bright white density on X-ray. May cause pain and obstruction.

R
Imaging Modalities

Resorption

The process by which bone or other tissue is broken down and removed. On X-ray it appears as an area…

R
Imaging Patterns

Reticular Pattern

A net-like or web-like pattern seen in the lungs on X-ray or CT. Associated with interstitial lung disease or fibrosis.

R
Cardiac

Retroperitoneum

The space behind the peritoneum (the membrane lining the abdominal cavity) containing the kidneys adrenal glands and major blood vessels.

R
Cardiac

Right Lateral View

A radiographic view taken with the animal lying on its right side. Commonly abbreviated as RL or R Lat.

S
Contrast Studies

Sagittal Plane

A vertical plane that divides the body into right and left halves. Used in MRI and CT to describe image…

S
Cardiac

Scintigraphy

A nuclear medicine imaging technique using a radioactive tracer to produce images of organ function. Used in veterinary medicine for…

S
Imaging Patterns

Scoliosis

An abnormal lateral (side-to-side) curvature of the spine. Visible on dorsoventral X-ray as a curved spine.

S
Imaging Patterns

Scout Image

A low-dose overview X-ray taken before a CT scan to plan the study and confirm patient positioning.

S
Image Quality

Sclerosis

Hardening and increased density of bone visible on X-ray as abnormally white areas. Can result from chronic pressure infection or…

S
Image Quality

Signal Intensity

The brightness or darkness of a structure in MRI imaging. Different tissues have characteristic signal intensities on T1 and T2…

S
Oncology

Silhouette Sign

A radiographic finding in which the border between two structures disappears because they are the same density and are touching.…

S
Oncology

Situs Inversus

A rare condition in which the internal organs are mirrored from their normal position. On X-ray the heart and other…

I
Imaging Patterns

Isodense

Having the same density on CT as the surrounding tissue making it difficult to distinguish without contrast.

I
Imaging Patterns

Isoechoic

Having the same echogenicity on ultrasound as the surrounding tissue making a lesion hard to detect.

J
Imaging Patterns

Joint Effusion

Accumulation of fluid within a joint space. On X-ray the joint space may appear widened and on ultrasound fluid is…

K
Abdominal Conditions

Kyphosis

An abnormal upward curvature of the spine (humpback appearance) visible on lateral X-ray images.

L
Equipment

Lateral View

A radiographic view taken from the side of the patient. It may be a right lateral (patient lying on right…

L
Oncology

Lead Apron

Protective clothing worn by veterinary staff during X-ray procedures to shield from radiation exposure.

L
Oncology

Lesion

An area of abnormal tissue or structure identified on imaging. Can describe tumors fractures infections or any abnormal finding.

L
Imaging Patterns

Lordosis

An inward curvature of the spine (hollow back) visible on lateral X-ray. May be normal in some species or indicate…

L
Contrast Studies

Lucency

A dark area on an X-ray or CT image indicating a structure that allows more X-rays to pass through. Often…

L
Abdominal Conditions

Lymphadenopathy

Enlargement of one or more lymph nodes visible on imaging. May indicate infection inflammation or cancer.

L
Contrast Studies

Lytic Lesion

An area of bone destruction visible on X-ray as a dark or missing area within the bone. Often associated with…

M
Abdominal Conditions

Magnetic Resonance Imaging

An imaging technique using strong magnetic fields and radio waves to produce detailed images of soft tissues without radiation. Excellent…

M
Contrast Studies

Magnification

Deliberate enlargement of a small area on X-ray by changing the geometry (distance) between the patient and detector. Helps visualize…

M
Imaging Patterns

Mass Effect

The displacement or compression of surrounding structures by a growing mass or lesion visible on imaging.

M
Imaging Patterns

Mediastinum

The central compartment of the chest containing the heart great vessels trachea esophagus and lymph nodes. Visible on chest X-ray…

M
Oncology

Medullary Cavity

The central hollow portion of a long bone containing bone marrow. Visible on X-ray as the relatively darker center of…

M
Oncology

Megacolon

Abnormal enlargement of the colon usually due to chronic constipation or nerve problems. Visible on X-ray as a massively distended…

M
Positioning

Megaesophagus

Abnormal dilation of the esophagus due to loss of motility. On X-ray it appears as a widened gas or fluid-filled…

M
Equipment

Metastasis

The spread of cancer from its primary location to other parts of the body. In veterinary radiology lung metastases appear…

M
Oncology

Mineralization

The deposition of mineral salts (usually calcium) in tissues. Appears as white areas on X-ray similar to bone.

M
Oncology

M-mode Ultrasound

A type of ultrasound that displays a single line of information over time. Commonly used in echocardiography to measure cardiac…

M
Imaging Patterns

Modality

A type of imaging method or technology. Common veterinary imaging modalities include radiography (X-ray) ultrasound CT MRI and scintigraphy.

M
Oncology

Myelography

An X-ray or CT study of the spinal cord performed after injecting contrast material into the spinal fluid. Used to…

N
Oncology

Nephrolith

A kidney stone visible on X-ray or CT as a dense white structure within the kidney.

N
Imaging Modalities

Nodule

A small well-defined round or oval lesion in an organ such as the lung liver or spleen. May be benign…

N
Image Quality

Nuclear Medicine

An imaging specialty using small amounts of radioactive substances to create images of organ function. Common in veterinary medicine for…

O
Imaging Patterns

Occlusion

Blockage of a vessel tube or passage. Detected on contrast imaging or Doppler ultrasound.

O
Anatomy

Opacity

A white or bright area on an X-ray image indicating absorption of X-rays by dense tissue such as bone fluid…

O
Abdominal Conditions

Orthogonal Views

Two radiographic views taken at 90 degrees to each other (usually lateral and dorsoventral or ventrodorsal). Required for accurate diagnosis…

O
Oncology

Ossification

The process of bone formation. On X-ray new bone formation appears as white areas in areas that were previously soft…

O
Oncology

Osteoarthritis

Degenerative disease of the joints causing cartilage breakdown and bone changes. On X-ray it shows as joint space narrowing osteophytes…

O
Imaging Modalities

Osteolysis

Destruction or dissolution of bone often due to tumor infection or metabolic disease. Appears as dark areas within bone on…

O
Imaging Modalities

Osteomyelitis

Infection of bone causing bone destruction and periosteal reaction. On X-ray it shows as lytic lesions and new bone formation.

O
Contrast Studies

Osteophyte

A bony outgrowth (spur) that develops around joints as part of degenerative joint disease. Visible on X-ray as irregular bony…

O
Oncology

Osteoporosis

Decreased bone density and strength. On X-ray affected bones appear lighter (less opaque) than normal.

O
Oncology

Osteosarcoma

The most common primary bone cancer in dogs. On X-ray it appears as a mixed lytic and productive lesion often…

P
Imaging Modalities

PACS

Picture Archiving and Communication System. A computer system used to store retrieve and transmit digital medical images in a veterinary…

P
Oncology

Pancreatitis

Inflammation of the pancreas. On ultrasound the pancreas appears enlarged and hypoechoic and there may be surrounding free fluid.

F
Imaging Patterns

Fluoroscopy

Real-time continuous X-ray imaging that displays moving images on a monitor. Used for dynamic studies such as swallowing evaluation or…

F
Oncology

Focal Opacity

A localized area of increased whiteness on X-ray limited to one specific region rather than being widespread.

F
Cardiac

Foramen

A natural opening or hole in bone through which nerves or blood vessels pass. Visible on X-ray and CT. Enlargement…

F
Oncology

Foreign Body

Any object inside the body that is not naturally there such as a swallowed toy or inhaled grass seed. X-ray…

F
Cardiac

Fracture

A break in a bone. X-rays are the primary tool for diagnosing fractures and are described by their location type…

G
Contrast Studies

Gadolinium

A contrast agent used in MRI imaging to improve visibility of abnormalities. It is injected intravenously and enhances areas with…

G
Abdominal Conditions

Gallbladder Mucocele

A condition in which the gallbladder fills with abnormally thick mucus creating a characteristic pattern on ultrasound. Can lead to…

G
Contrast Studies

Gas Pattern

The distribution and appearance of gas in the gastrointestinal tract on X-ray. Abnormal gas patterns may indicate obstruction ileus or…

G
Contrast Studies

Gastric Dilatation Volvulus

A life-threatening emergency in dogs in which the stomach fills with gas and rotates. On X-ray the stomach appears massively…

G
Image Quality

Gastrogram

An X-ray or fluoroscopic study of the stomach after administration of contrast material. Evaluates stomach size shape and emptying.

G
Imaging Patterns

Granuloma

A small area of chronic inflammation in tissue that may calcify over time. Appears on X-ray or CT as a…

G
Cardiac

Ground-glass Opacity

A hazy area on CT or X-ray that partially obscures the underlying structures like frosted glass. Often indicates early inflammation…

H
Abdominal Conditions

Half-value Layer

The thickness of material required to reduce the X-ray beam intensity by half. Used to measure X-ray beam quality and…

H
Abdominal Conditions

Heart Base Tumor

A tumor arising at the base of the heart near major vessels. May be detected on X-ray as an enlarged…

H
Imaging Patterns

Hemithorax

One half of the chest cavity (left or right). Used to describe the location of abnormalities such as unilateral pleural…

H
Anatomy

Hemothorax

Accumulation of blood in the chest cavity (pleural space). On X-ray it appears as a white hazy opacity on the…

H
Abdominal Conditions

Hepatomegaly

Enlargement of the liver visible on X-ray as the liver extending past its normal boundaries and on ultrasound as increased…

H
Oncology

Herniation

Protrusion of an organ or tissue through an abnormal opening. In veterinary radiology common hernias include diaphragmatic inguinal and perineal…

H
Image Quality

High-resolution CT

A specialized CT technique using thin slices and high-resolution algorithms to produce very detailed images particularly useful for lung disease.

H
Abdominal Conditions

Hip Dysplasia

An abnormal development of the hip joint causing laxity pain and arthritis. Diagnosed by X-ray using standardized views and scoring…

H
Imaging Patterns

Hounsfield Unit

A unit of measurement for tissue density on CT scans. Water measures 0 HU; bone is 400-1000 HU; fat is…

H
Abdominal Conditions

Hydronephrosis

Dilation (swelling) of the kidney caused by obstruction of urine flow. Detected on ultrasound as an enlarged fluid-filled kidney.

H
Contrast Studies

Hyperechoic

Appearing brighter than surrounding tissue on ultrasound. Often indicates fat gas calcification or dense tissue.

H
Oncology

Hyperinflation

Excessive inflation of the lungs visible on X-ray as very dark lung fields with flattened diaphragm. Indicates air trapping as…

H
Imaging Patterns

Hyperlucency

An area that appears abnormally dark (more transparent) on X-ray. May indicate air accumulation pneumothorax or decreased tissue density.

H
Image Quality

Hypoechoic

Appearing darker than surrounding tissue on ultrasound. Often indicates fluid cysts or certain tumors.

H
Cardiac

Hypoperfusion

Reduced blood flow to an organ or region. On contrast CT hypoperfused areas appear less bright than normally enhancing tissue.

I
Anatomy

Ileus

A condition in which intestinal movement (peristalsis) slows or stops causing accumulation of gas and fluid. Visible on X-ray as…

I
Cardiac

Image Intensifier

A device in fluoroscopy units that converts X-ray signals into a visible image displayed on a monitor in real time.

I
Abdominal Conditions

Infarction

Death of tissue due to interrupted blood supply. On imaging infarcts appear as areas that fail to enhance after contrast…

I
Abdominal Conditions

Infiltrate

An area of increased opacity in the lungs on X-ray representing fluid cells pus or other material in the air…

I
Imaging Modalities

Interstitial Pattern

A lung pattern on X-ray showing changes in the tissue framework (interstitium) between the air sacs. Appears as fine lines…

I
Oncology

Interventional Radiology

A medical specialty that uses imaging to guide minimally invasive procedures such as biopsies drainage and stent placement.

I
Image Quality

Intestinal Obstruction

A blockage in the intestines that prevents normal movement of food or fluid. On X-ray it shows as dilated loops…

I
Oncology

Intravenous Contrast

A contrast agent injected into a vein to highlight blood vessels organs and tumors on CT or X-ray imaging.

I
Imaging Patterns

Intussusception

A condition in which one segment of the intestine telescopes into an adjacent segment causing obstruction. Seen on ultrasound as…

I
Imaging Patterns

Iodine Contrast

A type of contrast agent containing iodine used for X-ray and CT imaging. It appears white on images because iodine…

C
Contrast Studies

Coronary Plane

A vertical plane that divides the body into front (ventral) and back (dorsal) halves. Used in CT and MRI imaging…

C
Equipment

Costochondral Junction

The point where the rib (bony portion) meets the cartilage. Visible on X-ray and may show abnormal changes in certain…

C
Oncology

Cranial

Toward the head end of the animal. A standard directional term used in veterinary radiology.

C
Oncology

Craniocaudal View

A radiographic view taken from the head end toward the tail end of the animal or limb. Often used for…

C
Cardiac

Crepitus

A grating sensation or sound caused by bone fragments or air in soft tissue. On X-ray it may be associated…

C
Anatomy

CT Angiography

A CT scan performed after injection of contrast material into the bloodstream to visualize blood vessels and detect vascular disease.

C
Oncology

Cyst

A sac-like pocket of fluid or semi-solid material. On ultrasound cysts appear anechoic (black) with smooth walls and posterior enhancement.

C
Anatomy

Cystogram

An X-ray or CT image of the urinary bladder filled with contrast material to evaluate its size shape and integrity.

D
Abdominal Conditions

Decubitus View

A radiographic view taken with the patient lying on its side. Useful for detecting free fluid or gas that shifts…

D
Cardiac

Degenerative Joint Disease

Progressive deterioration of joint cartilage and bone visible on X-ray as narrowed joint spaces bone spurs or sclerosis.

D
Image Quality

Densitometry

Measurement of bone or tissue density on imaging. Used to assess bone mineral density and evaluate conditions like osteoporosis.

D
Imaging Modalities

Diaphragm

The large muscle separating the chest and abdomen. Visible on X-ray and can be displaced by fluid masses or hernias.

D
Imaging Patterns

Diaphragmatic Hernia

A condition in which abdominal organs (such as the stomach or intestines) move through a tear in the diaphragm into…

D
Contrast Studies

DICOM

Digital Imaging and Communications in Medicine. The international standard format for storing and transmitting medical images between systems.

D
Contrast Studies

Diffuse Opacity

A widespread area of increased whiteness on an X-ray image affecting large portions of the lung or organ rather than…

D
Image Quality

Digital Radiography

A modern X-ray system that captures images digitally using electronic detectors instead of traditional film. Provides faster results and better…

D
Imaging Modalities

Doppler Ultrasound

A type of ultrasound that detects the speed and direction of blood flow by measuring frequency changes in reflected sound…

D
Positioning

Dorsal

Referring to the back or top side of the animal. A standard directional term used in veterinary imaging.

D
Anatomy

Dorsoventral View

An X-ray view in which the beam passes from the back (dorsal) to the belly (ventral) of the animal. Commonly…

D
Anatomy

Double Contrast Study

An imaging technique using both a positive contrast agent (such as barium) and a negative contrast agent (air) to outline…

D
Positioning

Dynamic Study

An imaging examination that captures motion over time such as fluoroscopy or contrast studies showing how organs function (e.g. swallowing…

E
Oncology

Echocardiography

Ultrasound imaging of the heart to evaluate cardiac structure and function. Allows assessment of heart chambers valves and blood flow.

E
Imaging Modalities

Echogenicity

The ability of a tissue to reflect ultrasound waves. Described as hyperechoic (bright) hypoechoic (dark) isoechoic (same brightness) or anechoic…

E
Oncology

Edema

Abnormal accumulation of fluid in tissues or cavities. On X-ray pulmonary edema appears as a white hazy pattern in the…

E
Contrast Studies

Effusion

A buildup of excess fluid in a body cavity such as the pleural space (chest) pericardial space (around the heart)…

E
Positioning

Embolism

Blockage of a blood vessel by a clot air bubble or other foreign material. Detected on CT angiography or nuclear…

E
Oncology

Emphysema

A condition in which air accumulates in abnormal places such as subcutaneous tissue (under the skin) or in the mediastinum.…

E
Anatomy

Endoscopy

A procedure using a flexible camera (endoscope) to visualize the inside of hollow organs such as the stomach or airway.…

E
Abdominal Conditions

Enema

Introduction of fluid (or contrast material) through the rectum into the colon for therapeutic purposes or to perform a contrast…

E
Equipment

Enteritis

Inflammation of the small intestine. May be visible on X-ray as dilated fluid-filled loops of bowel or on ultrasound as…

E
Imaging Patterns

Esophagram

An X-ray or fluoroscopic study of the esophagus (food tube) after swallowing contrast material such as barium.

E
Imaging Modalities

Excretory Urogram

An X-ray study of the kidneys ureters and bladder after injection of contrast material into a vein. Evaluates kidney function…

E
Imaging Modalities

Extravasation

Leakage of contrast material or fluid outside of a blood vessel or hollow organ into surrounding tissues. Detected on imaging…

F
Anatomy

Fading

Gradual loss of contrast or brightness on an X-ray image over time. Can occur with improper film processing or digital…

F
Positioning

Fat Opacity

The appearance of fat on X-ray and CT. Fat is less dense than soft tissue and appears darker (more gray)…

F
Contrast Studies

Feline Asthma

A common respiratory condition in cats causing airway inflammation and bronchospasm. On X-ray it often shows a bronchial pattern and…

F
Contrast Studies

Fistula

An abnormal tunnel-like connection between two body structures or between an organ and the skin. Can be detected with contrast…

F
Imaging Modalities

Fluid Line

A horizontal interface between fluid and air or gas seen on an upright or standing X-ray image. Indicates the presence…

A
Imaging Patterns

Aliasing

An artifact in ultrasound or MRI where blood flow or motion appears to go in the wrong direction because the…

A
Imaging Patterns

Alveolar Pattern

A type of lung pattern on X-ray where the air sacs (alveoli) are filled with fluid or cells instead of…

A
Imaging Patterns

Analog Radiography

Traditional film-based X-ray imaging that uses light-sensitive film to capture images. Now largely replaced by digital systems.

A
Cardiac

Anechoic

Describing a structure on ultrasound that appears completely black because it produces no echoes. Usually indicates fluid.

A
Imaging Patterns

Angiography

An imaging technique that uses contrast dye injected into blood vessels to visualize their structure and detect blockages or abnormalities.

A
Cardiac

Annular Lesion

In veterinary imaging and pathology, an annular lesion refers to a ring-shaped abnormality, often characterized by a central area with…

A
Contrast Studies

Aperture

The opening in an X-ray or CT machine through which the patient passes or through which the X-ray beam is…

A
Oncology

Archiving

The process of storing digital medical images and reports for future reference. In veterinary practices this is done using PACS…

A
Oncology

Artifact

Any feature on a medical image that does not represent actual anatomy or pathology but is caused by equipment limitations…

A
Contrast Studies

Ascites

Accumulation of free fluid in the abdominal cavity. On ultrasound and X-ray it appears as a large fluid collection surrounding…

A
Imaging Patterns

Aspiration Pneumonia

Inflammation of the lungs caused by inhaling foreign material such as food or vomit. Appears on X-ray as areas of…

A
Imaging Patterns

Atelectasis

Collapse or incomplete expansion of part or all of a lung. Appears as increased whiteness (opacity) on X-ray in the…

A
Imaging Patterns

Attenuation

The weakening of an X-ray beam as it passes through tissue. Dense tissues like bone attenuate more and appear whiter…

A
Oncology

Axial Plane

A horizontal cross-sectional view through the body — as if the body were sliced from front to back at a…

B
Abdominal Conditions

B-mode Ultrasound

The standard mode of ultrasound imaging that produces a 2D grayscale image of internal structures based on reflected sound waves.

B
Imaging Patterns

Barium Contrast Study

A diagnostic imaging technique in which barium sulfate (a white liquid) is swallowed or given as an enema to outline…

B
Abdominal Conditions

Beam Hardening

A CT artifact in which the X-ray beam becomes harder (higher energy) as it passes through dense objects. Creates dark…

B
Imaging Patterns

Biliary Sludge

A mixture of bile and crystals that appears as low-level echoes on ultrasound in the gallbladder. Often associated with liver…

B
Imaging Patterns

Bone Scan

A nuclear medicine imaging technique using a radioactive tracer to detect areas of abnormal bone metabolism such as tumors fractures…

B
Imaging Patterns

Bronchiectasis

Permanent widening and damage of the airways (bronchi) in the lungs. On X-ray and CT it appears as dilated thickened…

B
Imaging Patterns

Bronchogram

An image of the bronchial tubes (airways) created by filling them with contrast material to outline their structure.

C
Imaging Modalities

C-arm

A mobile X-ray machine shaped like the letter C that allows real-time imaging (fluoroscopy) during surgical or interventional procedures.

C
Imaging Patterns

Calcification

The buildup of calcium in tissues or organs appearing as bright white areas on X-ray and CT. Can occur in…

C
Contrast Studies

Calculus

A hard mineral deposit that forms in organs such as the urinary bladder, kidneys or salivary glands. Appears as a…

C
Imaging Patterns

Cardiomegaly

Enlargement of the heart visible on X-ray. Measured by the vertebral heart score (VHS) in veterinary patients.

C
Equipment

Caudal

Toward the tail end of the animal. Used as a directional term in veterinary radiology to describe image orientation.

C
Equipment

Cavitary Lesion

A hollow or cavity-containing area within tissue seen on imaging. May indicate abscess, tumor or fungal infection.

C
Image Quality

Centric

Referring to the center of an imaging field or body part. Used in positioning and image description.

C
Abdominal Conditions

Cephalic

Toward the head end of the animal. Used as a directional term in veterinary radiology.

C
Cardiac

Cholelithiasis

The presence of gallstones (stones in the gallbladder). Detected on ultrasound or X-ray as bright dense structures in the gallbladder.

C
Image Quality

Chylothorax

Accumulation of lymphatic fluid (chyle) in the chest cavity. Seen on X-ray as pleural effusion causing lung compression.

C
Positioning

Collimation

The process of narrowing and shaping the X-ray beam to target only the area of interest reducing radiation exposure to…

C
Imaging Modalities

Computed Tomography

An advanced imaging technique that uses X-rays taken from multiple angles and reconstructed by a computer to create detailed cross-sectional…

C
Contrast Studies

Consolidation

A condition in which the air spaces of the lungs fill with fluid cells or debris making the lung appear…

C
Image Quality

Contrast Agent

A substance introduced into the body to improve the visibility of internal structures on imaging studies. Can be given orally…

C
Abdominal Conditions

Contrast Enhancement

The increase in visibility of a structure on CT or MRI after contrast agent administration. Enhancing lesions have increased blood…

C
Imaging Modalities

Contrast Resolution

The ability of an imaging system to distinguish between structures of slightly different densities or signal intensities.

C
Cardiac

Conventional Radiography

Standard X-ray imaging that produces flat 2D images on film or digital detector. The most common imaging modality in veterinary…

E
Contrast Studies

Esophagram

A contrast-enhanced radiographic examination of the esophagus using positive contrast media to define luminal morphology and mucosal integrity.

A
Imaging Patterns

Air Bronchograms

A radiographic sign where air-filled bronchi are outlined by opaque, consolidated lung parenchyma, indicating alveolar disease.

E
Contrast Studies

Endoscopy

A diagnostic procedure utilizing a flexible endoscope to provide direct visualization of the esophageal and gastric mucosa.

C
Equipment

Complete Blood Count

A quantitative and qualitative hematological analysis of erythrocytes, leukocytes, and thrombocytes to assess inflammation or anemia.

B
Equipment

Biochemistry

A serum analysis measuring metabolic biomarkers, enzymes, and electrolytes to evaluate visceral organ function.

U
Equipment

Urinalysis

A screening that evaluates the physical, chemical, and microscopic properties of urine to assess renal and systemic health.

M
Cardiac

Mediastinal Mass

A space-occupying lesion within the mediastinum that may displace the trachea, esophagus, or heart.

E
Abdominal Conditions

Esophageal Foreign Body

The acute lodgment of an exogenous object within the esophageal lumen, often at sites of physiological narrowing.

E
Abdominal Conditions

Esophageal Perforation

A hole or tear in the wall of the esophagus, often caused by sharp foreign bodies or severe esophagitis, allowing…

A
Cardiac

Abdominocentesis

A procedure in which fluid is removed from the abdominal cavity using a needle for diagnostic or therapeutic purposes. Commonly…

A
Cardiac

Acoustic Enhancement

In veterinary ultrasound, acoustic enhancement (posterior enhancement) is increased echogenicity seen distal to fluid-filled structures (e.g., urinary bladder, cysts). It…

A
Oncology

Acoustic Shadow

Acoustic shadowing is a dark (anechoic) area distal to highly attenuating structures such as bone, calculi (stones), or gas. These…

A
Cardiac

Acoustic Window

An acoustic window is a structure or area that allows optimal transmission of ultrasound waves to visualize deeper tissues. In…

A
Cardiac

Adenopathy

Enlargement of lymph nodes detected on imaging. May indicate infection or cancer. Also called lymphadenopathy.

A
Imaging Patterns

Adynamic Ileus

A condition in which the intestines stop moving normally without a physical blockage. On X-ray it shows as gas-filled loops…

A
Oncology

Aeration

The amount of air within the lungs as seen on X-ray. Normal aeration means the lungs are properly inflated and…

A
Oncology

Aganglionic Megacolon

Abnormal enlargement of the colon due to missing nerve cells in the bowel wall. Seen on X-ray or contrast study…

A
Oncology

Air Trapping

A condition where air becomes trapped in the lungs or airways. On X-ray it appears as areas of the lung…

F
Imaging Modalities

Fluoroscopy

A dynamic radiographic modality providing real-time, continuous X-ray images, essential for assessing oropharyngeal and esophageal motility phases.

M
Anatomy

Mediastinum

The extrapleural space between the left and right pleural sacs, containing the trachea, esophagus, heart, and great vessels.

S
Abdominal Conditions

Stricture

A localized narrowing of a tubular organ (e.g. esophagus, urethra, intestine) caused by circumferential fibrous scar tissue, typically following deep…

E
Abdominal Conditions

Esophagitis

Inflammation of the esophageal mucosa, often secondary to gastroesophageal reflux (GERD), chronic emesis, or chemical/caustic ingestion.

D
Abdominal Conditions

Dysautonomia

A failure of the autonomic nervous system leading to widespread visceral dysfunction, including profound esophageal aperistalsis.

P
Oncology

Polymyositis

A generalized inflammatory disease of the skeletal muscles, which can lead to weakness and secondary megaesophagus.

H
Oncology

Hypothyroidism

A metabolic condition due to decreased levels of thyroid hormones.

H
Oncology

Hypoadrenocorticism

An endocrine disorder due to deficient secretion of glucocorticoids and/or mineralocorticoids by the adrenal cortex.

P
Abdominal Conditions

Persistent Right Aortic Arch

The most prevalent vascular ring anomaly where the right 4th aortic arch persists as the functional aorta; the esophagus is…

I
Abdominal Conditions

Idiopathic

A term used to describe a disease or condition that arises spontaneously or for which the cause is unknown.

V
Abdominal Conditions

Vascular Ring Anomalies

A group of congenital cardiovascular malformations where fetal aortic arches persist abnormally, forming a functional ring that constricts the esophagus…

V
Abdominal Conditions

Vomiting

The active, forceful expulsion of stomach contents involving abdominal contractions, retching, and nausea.

R
Abdominal Conditions

Regurgitation

The passive expulsion of undigested food or fluid from the esophagus before it reaches the stomach; unlike vomiting, it involves…

A
Cardiac

Aspiration Pneumonia

Lung infection or inflammation resulting from the inhalation of foreign material (saliva, gastric contents, or food) into the lower airways.

M
Abdominal Conditions

Megaesophagus

A clinical syndrome characterized by diffuse esophageal dilation and impaired secondary peristalsis, resulting from sensory or motor dysfunction of the…

S
Abdomen

Signs of intestinal obstruction in dogs: Radiographs, Diagnosis and When Surgery Is Needed

Intestinal obstruction in dogs is a common emergency that can quickly become life-threatening. Learn the signs of intestinal obstruction in…

D
Animal Type

Dog Bone Cancer Symptoms: Radiographic Clues and Early Detection of Osteosarcoma in Dogs

Dog bone cancer symptoms in dogs often start with progressive lameness, pain, swelling, and poor response to NSAIDs. Learn how…

A
Oncology

Archiving

The process of storing digital medical images and reports for future reference. In veterinary practices this is done using PACS…

A
Oncology

Artifact

Any feature on a medical image that does not represent actual anatomy or pathology but is caused by equipment limitations…

A
Contrast Studies

Ascites

Accumulation of free fluid in the abdominal cavity. On ultrasound and X-ray it appears as a large fluid collection surrounding…

A
Imaging Patterns

Aspiration Pneumonia

Inflammation of the lungs caused by inhaling foreign material such as food or vomit. Appears on X-ray as areas of…

A
Imaging Patterns

Atelectasis

Collapse or incomplete expansion of part or all of a lung. Appears as increased whiteness (opacity) on X-ray in the…

A
Imaging Patterns

Attenuation

The weakening of an X-ray beam as it passes through tissue. Dense tissues like bone attenuate more and appear whiter…

A
Oncology

Axial Plane

A horizontal cross-sectional view through the body — as if the body were sliced from front to back at a…

B
Abdominal Conditions

B-mode Ultrasound

The standard mode of ultrasound imaging that produces a 2D grayscale image of internal structures based on reflected sound waves.

B
Imaging Patterns

Barium Contrast Study

A diagnostic imaging technique in which barium sulfate (a white liquid) is swallowed or given as an enema to outline…

F
Imaging Modalities

Fluoroscopy

A dynamic radiographic modality providing real-time, continuous X-ray images, essential for assessing oropharyngeal and esophageal motility phases.

E
Contrast Studies

Esophagram

A contrast-enhanced radiographic examination of the esophagus using positive contrast media to define luminal morphology and mucosal integrity.

A
Imaging Patterns

Air Bronchograms

A radiographic sign where air-filled bronchi are outlined by opaque, consolidated lung parenchyma, indicating alveolar disease.

E
Contrast Studies

Endoscopy

A diagnostic procedure utilizing a flexible endoscope to provide direct visualization of the esophageal and gastric mucosa.

C
Equipment

Complete Blood Count

A quantitative and qualitative hematological analysis of erythrocytes, leukocytes, and thrombocytes to assess inflammation or anemia.

B
Equipment

Biochemistry

A serum analysis measuring metabolic biomarkers, enzymes, and electrolytes to evaluate visceral organ function.

U
Equipment

Urinalysis

A screening that evaluates the physical, chemical, and microscopic properties of urine to assess renal and systemic health.

M
Cardiac

Mediastinal Mass

A space-occupying lesion within the mediastinum that may displace the trachea, esophagus, or heart.

E
Abdominal Conditions

Esophageal Foreign Body

The acute lodgment of an exogenous object within the esophageal lumen, often at sites of physiological narrowing.

E
Abdominal Conditions

Esophageal Perforation

A hole or tear in the wall of the esophagus, often caused by sharp foreign bodies or severe esophagitis, allowing…

A
Cardiac

Abdominocentesis

A procedure in which fluid is removed from the abdominal cavity using a needle for diagnostic or therapeutic purposes. Commonly…

A
Cardiac

Acoustic Enhancement

In veterinary ultrasound, acoustic enhancement (posterior enhancement) is increased echogenicity seen distal to fluid-filled structures (e.g., urinary bladder, cysts). It…

A
Oncology

Acoustic Shadow

Acoustic shadowing is a dark (anechoic) area distal to highly attenuating structures such as bone, calculi (stones), or gas. These…

A
Cardiac

Acoustic Window

An acoustic window is a structure or area that allows optimal transmission of ultrasound waves to visualize deeper tissues. In…

A
Cardiac

Adenopathy

Enlargement of lymph nodes detected on imaging. May indicate infection or cancer. Also called lymphadenopathy.

A
Imaging Patterns

Adynamic Ileus

A condition in which the intestines stop moving normally without a physical blockage. On X-ray it shows as gas-filled loops…

A
Oncology

Aeration

The amount of air within the lungs as seen on X-ray. Normal aeration means the lungs are properly inflated and…

A
Oncology

Aganglionic Megacolon

Abnormal enlargement of the colon due to missing nerve cells in the bowel wall. Seen on X-ray or contrast study…

A
Oncology

Air Trapping

A condition where air becomes trapped in the lungs or airways. On X-ray it appears as areas of the lung…

A
Imaging Patterns

Aliasing

An artifact in ultrasound or MRI where blood flow or motion appears to go in the wrong direction because the…

A
Imaging Patterns

Alveolar Pattern

A type of lung pattern on X-ray where the air sacs (alveoli) are filled with fluid or cells instead of…

A
Imaging Patterns

Analog Radiography

Traditional film-based X-ray imaging that uses light-sensitive film to capture images. Now largely replaced by digital systems.

A
Cardiac

Anechoic

Describing a structure on ultrasound that appears completely black because it produces no echoes. Usually indicates fluid.

A
Imaging Patterns

Angiography

An imaging technique that uses contrast dye injected into blood vessels to visualize their structure and detect blockages or abnormalities.

A
Cardiac

Annular Lesion

In veterinary imaging and pathology, an annular lesion refers to a ring-shaped abnormality, often characterized by a central area with…

A
Contrast Studies

Aperture

The opening in an X-ray or CT machine through which the patient passes or through which the X-ray beam is…

M
Anatomy

Mediastinum

The extrapleural space between the left and right pleural sacs, containing the trachea, esophagus, heart, and great vessels.

S
Abdominal Conditions

Stricture

A localized narrowing of a tubular organ (e.g. esophagus, urethra, intestine) caused by circumferential fibrous scar tissue, typically following deep…

E
Abdominal Conditions

Esophagitis

Inflammation of the esophageal mucosa, often secondary to gastroesophageal reflux (GERD), chronic emesis, or chemical/caustic ingestion.

D
Abdominal Conditions

Dysautonomia

A failure of the autonomic nervous system leading to widespread visceral dysfunction, including profound esophageal aperistalsis.

P
Oncology

Polymyositis

A generalized inflammatory disease of the skeletal muscles, which can lead to weakness and secondary megaesophagus.

H
Oncology

Hypothyroidism

A metabolic condition due to decreased levels of thyroid hormones.

H
Oncology

Hypoadrenocorticism

An endocrine disorder due to deficient secretion of glucocorticoids and/or mineralocorticoids by the adrenal cortex.

P
Abdominal Conditions

Persistent Right Aortic Arch

The most prevalent vascular ring anomaly where the right 4th aortic arch persists as the functional aorta; the esophagus is…

V
Abdominal Conditions

Vascular Ring Anomalies

A group of congenital cardiovascular malformations where fetal aortic arches persist abnormally, forming a functional ring that constricts the esophagus…

I
Abdominal Conditions

Idiopathic

A term used to describe a disease or condition that arises spontaneously or for which the cause is unknown.

V
Abdominal Conditions

Vomiting

The active, forceful expulsion of stomach contents involving abdominal contractions, retching, and nausea.

R
Abdominal Conditions

Regurgitation

The passive expulsion of undigested food or fluid from the esophagus before it reaches the stomach; unlike vomiting, it involves…

A
Cardiac

Aspiration Pneumonia

Lung infection or inflammation resulting from the inhalation of foreign material (saliva, gastric contents, or food) into the lower airways.

M
Abdominal Conditions

Megaesophagus

A clinical syndrome characterized by diffuse esophageal dilation and impaired secondary peristalsis, resulting from sensory or motor dysfunction of the…

M
Abdominal Conditions

Megaesophagus

A clinical syndrome characterized by diffuse esophageal dilation and impaired secondary peristalsis, resulting from sensory or motor dysfunction of the…

I
Animal Type

IVDD in Dogs: How Radiographs, CT, and MRI Guide Diagnosis and Treatment Decisions

A clinical guide to IVDD in dogs: neurologic grading, what spinal radiographs show and miss, when to escalate to CT…

R
Abdominal Conditions

Radiographic Signs of Canine Cardiac Disease: VHS, VLAS, and When to Use Echocardiography

Learn how to identify cardiac enlargement on canine radiographs using VHS and VLAS, recognize pulmonary changes, and determine when echocardiography…

C
Anatomy

Canine Thoracic Radiograph Interpretation: A Systematic Approach for General Practitioners

How to identify, characterize, and stage pulmonary masses and nodules on canine radiographs, and when radiographs are enough versus when…

C
Animal Type

Canine Lung Cancer on Radiographs: Primary Tumors, Metastatic Disease, and When to Push for CT

How to identify, characterize, and stage pulmonary masses and nodules on canine radiographs, and when radiographs are enough versus when…

M
Abdominal Conditions

Megaesophagus in Dogs: Radiographic Diagnosis, Aspiration Pneumonia Risk, and Clinical Management

Learn how to diagnose megaesophagus in dogs on radiographs, recognize aspiration pneumonia risk, investigate underlying causes, and manage canine megaesophagus…

P
Abdominal Conditions

Pleural Effusion in Cats: Radiographic Diagnosis, Differential Diagnosis by Signalment, and Triage Decisions

Pleural effusion in cats is a major cause of respiratory distress. Learn the key radiographic signs, signalment-based differentials, and how…

S
Imaging Patterns

SignalPET Showcases Veterinary AI on WFAA+ Good Morning Texas

SignalPET was featured on WFAA+ Good Morning Texas, showcasing how its AI-powered radiology platform helps veterinarians interpret X-rays faster and…

D
Abdomen

Diaphragmatic Hernia in Dogs and Cats: Diagnosis, Imaging Strategies, and the Impact of AI

A diaphragmatic hernia occurs when abdominal viscera protrude through a defect in the diaphragm into the thoracic cavity. In small…

U
Abdomen

Uterine Distension in Dogs and Cats: Detection, Interpretation, and the Clinical Value of AI

Uterine distension in dogs and cats can indicate serious reproductive disease such as pyometra, mucometra, or metritis. Learn how to…

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Abdominal Conditions

Thoracic Masses in Dogs and Cats: Diagnostic Approach, Imaging Strategies, and the Role of AI

This article explores the major causes of thoracic masses, how to localize them radiographically, when to pursue advanced diagnostics, and…

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Anatomy

Increased Thoracic Opacities

Increased thoracic opacity on radiographs can indicate pulmonary disease, thoracic masses, or pleural effusion in dogs and cats. This guide…

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Equipment

Lysis of the Third Phalanx: Why Early Detection Matters and How Al Can Help

Lysis of the third phalanx also referred to as P3 bone loss characterised by destruction or resorption of this bone…

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Abdominal Conditions

Left Atrial Enlargement in Dogs and Cats: Detection, Interpretation, and the Clinical Value of AI

Left atrial enlargement (LAE) is a common but important radiographic and echocardiographic finding in small animal cardiology. LAE commonly reflects…

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Abdomen

Abdominal Masses in Dogs and Cats: Detection, Diagnostic Strategies, and the Role of AI

The discovery of an abdominal mass in dogs and cats is a clinically significant finding. These masses can arise from…

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Contrast Studies

Comparison of radiological interpretation made by veterinary radiologists and state-of-the-art commercial AI software for canine and feline radiographic studies

As human medical diagnostics are scarcely available, especially in veterinary care, artificial intelligence (AI) has been increasingly used as a…

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Image Quality

Interview With the SignalPET Team

SignalPET, which was founded in 2018, uses AI and machine learning technology to analyze radiographs and standardize interpretation, which helps…

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Blog

Optimizing Your Radiography Technique for Joint Assessments

Radiographs offer invaluable visualization of the bony structures involved in canine lameness and joint disease. However, obtaining properly positioned, high-quality…

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Blog

Enhancing Your Proficiency in Canine Lameness Assessment

As veterinary professionals, accurately evaluating and diagnosing the cause of lameness in canine patients is one of the most critical…

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Abdominal Conditions

A Review of Diaphragmatic Hernias

Diaphragmatic hernias are commonly recognized by small animal clinicians and may be congenital or traumatic in origin, and acute or…

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Abdominal Conditions

Artificial Intelligence is revolutionizing veterinary medicine. Are you missing out?

This month, dvm360's August 2021 article by Karen Todd-Jenkins, VMD, discusses how artificial intelligence solutions can help advance your veterinary practice's capabilities.…

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Blog

Better Teeth, Better Health. A Reason to SMILE.

According to the American Veterinary Dental Society, approximately 80% of dogs and 70% of cats over 3 years of age…

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Abdominal Conditions

Imaging the Coughing Dog

Coughing is one of the most common presenting complaints for dogs in small animal practices. The clinical signs associated with…

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Blog

Canine Osteoarthritis – Ache it until they can’t make it

Canine osteoarthritis (OA) is a very common problem that affects between one-third to one-half of all canines at some point…

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Blog

Breed all about it – A tribute to the Golden Retriever…

The interpretation of thoracic radiographs is a fundamental component of small animal practice. Identifying an increased opacity is a common…

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Abdominal Conditions

Festive Follies – Tis the season for esophageal foreign bodies!

As we get to crack open the wine and tuck into the delicacies, we wanted to reflect on some common…

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Imaging Patterns

Radiology Case of the Week | Feline Miliary Pulmonary Pattern

In this Week's Radiology Case, we take a dive into Feline Miliary Pulmonary Pattern, going over the radiographic appearance and…

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Abdominal Conditions

Radiology Case of the Week | Peritoneal Pericardial Diaphragmatic Hernias

Peritoneal-pericardial diaphragmatic hernia (PPDH) is a congenital condition whereby the normal anatomic separation between the pericardium and peritoneal cavity fails…

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Image Quality

Radiology Case of the Week | Feline Radial Hemimelia

Recently, we have seen two cases of feline radial hemimelia, in which the radius is incompletely formed or absent.