A Case of Abdominal Aortic Aneurysm Draining into an Anomalous Left Renal Vein

Abstract

We report a case of a fistula from an abdominal aortic aneurysm (AAA) draining into an anomalous renal vein. An 80-year-old man with IgA nephropathy complained of back and abdominal pain. His abdomen was slightly distended and a pulsatile mass was observed near the navel. A blood test revealed inflammatory changes and slight renal damage. Enhanced computed tomography (CT) showed an AAA penetrating into an anomalous left renal vein. An emergency operation was performed and the aneurysm was replaced with a bifurcated prosthetic graft, whereupon the fistula was closed. The postoperative course was uneventful. Aortovenous fistula, especially to an anomalous left renal vein, is a very rare complication of AAA; enhanced CT can be a useful modality for diagnosing such complications.