NAVLE Diagnostic Imaging Interpretation 3

Question 1

Which radiographic finding is MOST consistent with pyloric outflow obstruction in a dog?

Accepted Answer

Markedly distended stomach with delayed gastric emptying

Answer

Pyloric obstruction causes gastric outflow failure, producing marked gastric distension with delayed or absent contrast passage on fluoroscopy.

Question 2

On a lateral thoracic radiograph, 'sternal contact' of the heart is increased in which cardiac condition?

Accepted Answer

Right ventricular enlargement

Answer

Right ventricular enlargement causes the heart to shift cranioventrally, increasing its contact with the sternum on the lateral view.

Question 3

Which ultrasound artifact is produced when sound reflects between two parallel, highly reflective surfaces and appears as equidistant lines deep to the structure?

Accepted Answer

Reverberation artifact

Answer

Reverberation artifact occurs when the sound beam bounces between two reflective interfaces, producing multiple parallel echogenic lines at regular intervals.

Question 4

On MRI, T2-weighted sequences are MOST useful for identifying:

Accepted Answer

Fluid-filled structures and edema

Answer

T2-weighted MRI sequences produce high signal (bright) from fluid, making them ideal for identifying edema, effusions, and fluid-filled structures.

Question 5

A 'string of pearls' sign on abdominal radiographs of a cat refers to:

Accepted Answer

Small gas bubbles trapped between intestinal folds indicating ileus

Answer

The 'string of pearls' sign describes small gas bubbles trapped between the valvulae conniventes in paralytic ileus, indicating functional obstruction.

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE Diagnostic Imaging Interpretation 3