NAVLE Small Animal Diagnostic Imaging 5

Question 1

On abdominal radiographs, a 'gravel sign' (multiple small mineral opacities) within a bowel loop is most suggestive of:

Accepted Answer

Small intestinal foreign body obstruction

Answer

The 'gravel sign' represents accumulation of mineral debris proximal to a small intestinal obstruction where normal transit is blocked, concentrating ingested minerals.

Question 2

Which Doppler modality provides a color-coded two-dimensional map of blood flow direction and velocity within a vessel or cardiac chamber?

Accepted Answer

Color flow Doppler

Answer

Color flow Doppler superimposes a color-coded map of mean flow velocity and direction over the B-mode image, using red/blue by convention for flow toward/away from the transducer.

Question 3

A dog has a myelogram that shows a contrast column that is deviated to one side and compressed at a single level but does not completely stop. This pattern is most consistent with:

Accepted Answer

Extradural compression (disc herniation)

Answer

Extradural lesions (such as disc material or vertebral bone) deviate and compress the contrast column from the outside without interrupting the intrathecal flow completely.

Question 4

On ultrasound of the urinary bladder, a dependent hyperechoic layer with acoustic shadowing that moves when the patient is repositioned most likely represents:

Accepted Answer

Uroliths (bladder stones)

Answer

Uroliths are hyperechoic foci with acoustic shadowing that are gravity-dependent and shift position when the patient moves, distinguishing them from wall masses.

Question 5

Which MRI finding is characteristic of syringomyelia (syrinx) in a Cavalier King Charles Spaniel with Chiari-like malformation?

Accepted Answer

T2 hyperintense fluid-filled cavity within the spinal cord

Answer

A syrinx appears as a T2 hyperintense (fluid signal) cavity within the spinal cord parenchyma on MRI, reflecting the accumulation of CSF-like fluid.

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE - North American Veterinary Licensing Examination Practice Test

NAVLE Small Animal Diagnostic Imaging 5