Diagnostic Imaging Interpretation 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 Diagnostic Imaging Interpretation flashcards as text
On a lateral thoracic radiograph of a dog, which structure should be used to assess left atrial enlargement?
Answer: Dorsal elevation of the left mainstem bronchus
Left atrial enlargement causes dorsal elevation and splaying of the left mainstem bronchus (carina angle >60°) on lateral radiographs.
Which ultrasonographic finding is MOST consistent with gastric dilatation-volvulus (GDV) versus simple dilatation in a dog?
Answer: Compartmentalization of the stomach into two gas-filled regions on the right lateral view
GDV causes the stomach to rotate, creating a compartmentalized 'double bubble' appearance, whereas simple dilatation shows uniform distension.
Acoustic shadowing on ultrasound is caused by:
Answer: Complete absorption or reflection of the sound beam by a highly attenuating structure
Dense structures such as calculi or bone absorb or reflect nearly all the ultrasound energy, preventing transmission and creating a shadow distal to the structure.
In equine foot radiography, which landmark is used to assess the position of the navicular bone relative to the distal phalanx?
Answer: Palmar angle of the distal phalanx relative to the ground surface
The palmar angle of P3 on lateral foot radiographs is used to assess navicular bone position and the degree of podotrochlear pathology.
On CT myelography of a dog, an 'intramedullary' lesion is characterized by:
Answer: Fusiform swelling of the spinal cord with thinning of the contrast column on all sides
Intramedullary lesions expand the cord itself, producing symmetric fusiform cord enlargement that thins the contrast column circumferentially.
Which finding on plain thoracic radiographs is MOST suggestive of a cranial mediastinal mass in a cat?
Answer: Loss of the cranial cardiac border and elevation of the trachea
Cranial mediastinal masses obscure the cranial cardiac silhouette and displace the trachea dorsally or laterally, a common presentation in cats with lymphoma.
On abdominal radiographs, which finding is MOST consistent with uroabdomen (uroperitoneum) in a dog?
Answer: Loss of serosal detail with retrograde urethrogram showing contrast extravasation
Uroabdomen presents as loss of intraperitoneal serosal detail (due to urine effusion); a retrograde urethrogram or cystogram confirms contrast extravasation at the rupture site.