Pancreatic arteriovenous malformation involving adjacent duodenum in a patient with gastrointestinal bleeding.

Gastrointestinal bleeding caused by arteriovenous malformation (AVM) of the pancreas is extremely rare. A 56-yr-old man with AVM of the head of the pancreas who was presented with recurrent episode of melena is described herein. The preoperative diagnosis was confirmed by angiographic study, and he was successfully treated with pancreatoduodenectomy. Histological examination of the resected specimen revealed pancreatic AVM involving the adjacent duodenal wall.