Transcatheter embolization of an inferior mesenteric arteriovenous fistula with frequent mucous diarrhea

We report a case of inferior mesenteric arteriovenous fistula without portal hypertension or mesenteric ischemia. A 64-year-old man had developed frequent mucous diarrhea during the previous month. Colonoscopy showed highly edematous mucosa of the rectum. Barium enema demonstrated localized stricture of the same part but no evidence of malignancy. Finally we established a diagnosis by 3D-CT and selective abdominal angiography. Transcatheter arterial embolization was successfully performed. After that, his symptoms gradually improved as all abnormal findings on colonoscopy, barium enema and abdominal CT disappeared.