Journal of the South African Veterinary Association
On-line version ISSN 2224-9435
Print version ISSN 1019-9128
YOON, H et al. Contrast-enhanced computed tomography angiography and volume-rendered imaging for evaluation of cellophane banding in a dog with extrahepatic portosystemic shunt. J. S. Afr. Vet. Assoc. [online]. 2011, vol.82, n.2, pp.125-128. ISSN 2224-9435.
A 4-year-old, 1.8 kg, male, castrated Maltese was presented for evaluation of urolithiasis. Urinary calculi were composed of ammonium biurate. Preprandial and postprandial bile acids were 44.2 and 187.3 µmol/ℓ , respectively (reference ranges 0-10 and 0-20 µmol/ℓ , respectively). Single-phase contrast-enhanced computed tomography angiography (CTA) with volume-rendered imaging (VRI) was obtained. VRI revealed a portocaval shunt originating just cranial to a tributary of the gastroduodenal vein and draining into the caudal vena cava at the level of the epiploic foramen. CTA revealed a 3.66 mm-diameter shunt measured at the level of the termination of the shunt and a 3.79 mm-diameter portal vein measured at the level between the origin of the shunt and the porta of the liver. Surgery was performed using cellophane banding without attenuation. Follow-up single-phase CTA with VRI was obtained 10 weeks after surgery. VRI revealed no evidence of portosystemic communication on the level of a cellophane band and caudal to the cellophane band. CTA demonstrated an increased portal vein diameter (3.79-5.27 mm) measured at the level between the origin of the shunt and the porta of the liver. Preprandial and postprandial bile acids were 25 and 12.5 µmol/ℓ, respectively (aforementioned respective reference ranges), 3 months post-surgery. No problems were evident at 6 months.
Keywords : cellophane banding; contrast-enhanced computed tomography angiography; extrahepatic portosystemic shunt; volume-rendered imaging.