Inferior mesenteric arteriovenous fistula (AVF) is a rare vascular abnormality that may be either congenital or acquired. It usually presents with abdominal pain, gastrointestinal bleeding, and a palpable mass with thrill or portal hypertension; it may also elicit more serious complications such as colonic ischemia. We report a case of idiopathic inferior mesenteric AVF in a 75-year-old man who presented with recurrent ischemic colitis. To our knowledge, this is the first reported case in Korea of an idiopathic inferior mesenteric AVF without any surgical or traumatic history.
