Congenital portosystemic shunts in foals are rare and only a small number of cases have been described. Detailed\ndescription of the course of the shunt is lacking in earlier reports. This is the first detailed description of a computed\ntomography angiography (CTA) displaying an extra-hepatic splenocaval shunt. A 1-month old colt showing increasing\nsigns of dullness, ataxia, circling, lip-smacking and coordination problems was presented. Hyperammonemia was\ndetected and abdominal CTA revealed an extra-hepatic portocaval shunt. During surgery, ligation of the abnormal\nvessel could not be achieved, and the foal was euthanized because of complications during surgery. CTA provided a\ndetailed overview of portal vasculature. If a portosystemic shunt is suspected in a foal, CTA can be used to confirm the\ndiagnosis and for surgical planning.
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