NAVLE Small Animal Diagnostic Imaging 3

Question 1

A dog's abdominal ultrasound reveals a splenic mass with a 'target' or 'bull's-eye' lesion appearance (hypoechoic halo around a hyperechoic center). This pattern is most associated with:

Accepted Answer

Metastatic neoplasia

Answer

A target or bull's-eye lesion pattern in the spleen is classically associated with metastatic disease, where a necrotic center is surrounded by viable tumor tissue.

Question 2

On a ventrodorsal thoracic radiograph, the cardiac silhouette of a healthy dog should not exceed what percentage of the thoracic width at the level of the 8th rib?

Accepted Answer

60%

Answer

The cardiac silhouette on a VD projection normally occupies no more than 60% of the thoracic width at the level of the 8th intercostal space.

Question 3

Which MRI sequence best demonstrates hemorrhage of varying ages due to its sensitivity to paramagnetic effects of blood breakdown products?

Accepted Answer

Gradient echo (GRE/T2*)

Answer

Gradient echo sequences are highly sensitive to susceptibility effects caused by hemosiderin and deoxyhemoglobin, making them ideal for detecting hemorrhage.

Question 4

A radiograph of a cat's elbow shows periarticular soft tissue swelling and subchondral bone lysis without significant new bone production. This pattern is most consistent with:

Accepted Answer

Septic arthritis

Answer

Septic arthritis characteristically causes joint space narrowing, subchondral bone lysis, and periarticular soft tissue swelling with minimal productive bone response.

Question 5

During abdominal ultrasound, the normal feline adrenal gland has which characteristic appearance?

Accepted Answer

Bilobed hypoechoic structure with a hyperechoic medulla, less than 4.3mm width

Answer

Normal feline adrenal glands are bilobed (peanut-shaped) with a hypoechoic cortex and hyperechoic medulla, measuring less than 4.3mm in width.

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE Small Animal Diagnostic Imaging 3