Page 450 - Atlas of Small Animal CT and MRI

440 Atlas of Small Animal CT and MRI

Figure 4.4.19 Vena Cava Atresia with Aneurism and Thrombosis (Canine) CT

(a) CT+C, TP (b) CT+C, TP (c) CT+C, TP

(d) CT+C, TP (e) CT+C, SP
10mo F English Bulldog with history of collapsing episodes following physical exertion. Following contrast administration through a
catheter placed in the saphenous vein, contrast medium pools in the caudal abdominal vena cava (a: arrowhead). In the mid abdomen,
the vena cava diameter is markedly enlarged, and the lumen remains unenhanced (b: arrowhead). A large number of distended veins
result from venous recruitment as an alternate venous return path (b: arrows). Following a short delay, image c was acquired at the same
anatomic level as image b, revealing nearly complete obstruction of the vena cava at this level, with only a thin rim of contrast medium
visible (c: arrowhead). Image d was acquired cranial to images b and c and reveals no demonstrative vena cava at this level. Descending
aorta (d: arrow), portal vein (d: arrowhead). The size of the caval thrombus is best appreciated in image e (arrowheads). Given the age
of the patient and duration of clinical signs, this was thought to represent atresia of the vena cava with secondary thrombosis.

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