Concurrence of Circumcaval Ureter and Congenital Extrahepatic Portosystemic Shunt in a Cat

A 5-month-old male Maine Coon cat was presented to the hospital with persistent salivation for 2 weeks. Serum biochemistry showed markedly elevated levels of blood ammonia and bile acids. An abdominal computed tomography discovered a shunt from the left gastric to the left phrenic vein, and the right ureter was seen to descend to the level of L4 and L5 normally and then pass dorsally and medially to the caudal vena cava, thus forming a loop. The present case, in which a circumcaval ureter and a congenital extrahepatic portosystemic shunt were diagnosed concurrently in a cat, was extremely rare and was subsequently confirmed by surgery. Based on the reviewed literature, this is the first case report of the concurrence of a circumcaval ureter and a congenital extrahepatic portosystemic shunt in a cat.