Small Animal Diagnostic Imaging Flashcards
7 cards from real NAVLE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Small Animal Diagnostic Imaging flashcards as text
On abdominal radiographs, a 'gravel sign' (multiple small mineral opacities) within a bowel loop is most suggestive of:
Answer: Small intestinal foreign body obstruction
The 'gravel sign' represents accumulation of mineral debris proximal to a small intestinal obstruction where normal transit is blocked, concentrating ingested minerals.
Which Doppler modality provides a color-coded two-dimensional map of blood flow direction and velocity within a vessel or cardiac chamber?
Answer: Color flow Doppler
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.
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:
Answer: Extradural compression (disc herniation)
Extradural lesions (such as disc material or vertebral bone) deviate and compress the contrast column from the outside without interrupting the intrathecal flow completely.
On ultrasound of the urinary bladder, a dependent hyperechoic layer with acoustic shadowing that moves when the patient is repositioned most likely represents:
Answer: Uroliths (bladder stones)
Uroliths are hyperechoic foci with acoustic shadowing that are gravity-dependent and shift position when the patient moves, distinguishing them from wall masses.
Which MRI finding is characteristic of syringomyelia (syrinx) in a Cavalier King Charles Spaniel with Chiari-like malformation?
Answer: T2 hyperintense fluid-filled cavity within the spinal cord
A syrinx appears as a T2 hyperintense (fluid signal) cavity within the spinal cord parenchyma on MRI, reflecting the accumulation of CSF-like fluid.
On abdominal radiographs, which finding is MOST consistent with a congenital portosystemic shunt in a young dog?
Answer: Microhepatica (small liver) with renomegaly
Congenital portosystemic shunts divert hepatotrophic factors away from the liver, causing microhepatica; compensatory renal hypertrophy often produces concurrent renomegaly.
A cat's thoracic CT shows a pulmonary mass with a 'halo sign' (ground-glass opacity surrounding a solid nodule). This finding in cats is most associated with:
Answer: Fungal pneumonia (cryptococcosis)
The CT halo sign represents hemorrhage or inflammatory infiltrate surrounding a fungal nodule and is classically associated with angioinvasive fungal infections including Cryptococcus in cats.