left IIAA (maximum diameter 50 mm) 3 years previously. The distal branches of the internal iliac artery were not occluded, but the distal main trunk of the IIAA was treated by coil embolization. Endovascular abdominal aortic repair was originally selected because he had a history of total gastrectomy for gastric cancer as well as unknown procedures to treat colon and rectal cancer via several laparotomies. Postoperative computed tomography (CT) after EVAR revealed the absence of endoleaks and an unchanged aneurysmal diameter (Fig. 1). A high fever suddenly developed 32 months later, and his general practitioner found the following: white blood cells 8,400/µL and C-reactive protein, 5.8 mg/dL, indicating infl ammatory changes. All other fi ndings were unremarkable. He was prescribed with oral antibiotics (Cefcapene pivoxil hydrochloride hydrate, 200 mg/day) and sent home. However, he was admitted to hospital one week later with persistent fever and black tarry stools. The physical fi ndings upon admission were as follows: body temperature, 38°C; blood pressure, 158/70 mmHg; heart rate, 70 beats/ min. Plain CT showed that although the diameter of the IIAA sac had remained at 50 mm, it contained air bubbles (Fig. 2a). Colon fi berscopy revealed an ulcer at the sigmoid colon. Retrograde colonography showed gastrografi n running into the IIAA sac (Fig. 2b). These fi ndings confi rmed a left IIAA-sigmoid colonic fi stula without active bleeding from the IIAA. Gastroenterological surgeons ruled out radical surgery for IIAA-colonic fi stula for this compromised patient and palliative surgery (colostomy creation) proceeded via a median laparotomy. Intraperitoneal adhesions were so severe that they could not be divided, especially between the sigmoid colon and the IIAA, and thus the sigmoid colon was transected at the oral position of the fi stula. A colostomy was created at the oral side of the stump, the anal side of which was closed. The IIAA and the stent-graft remained untouched. The patient was post-surgically administered with meropenem (1 g/day for two weeks) and sulfamethoxazoletrimethoprim (1,800 mg/day for 5 months). The patient has remained free of symptoms of infection and melena for 1 year (Fig. 3).We describe rare ilio-enteric fi stula that developed after endovascular repair of a left internal iliac artery aneurysm (IIAA). An 83-year-old man with a history of previous surgeries via laparotomies suddenly developed a high fever 3 years after undergoing endovascular abdominal aortic repair (EVAR) with a stent-graft to treat a left isolated IIAA. Computed tomography imaging revealed a fi stula between the IIAA and the sigmoid colon. A colostomy was created because severe intraperitoneal adhesions prevented resection of the IIAA. The postoperative course was uneventful and the patient remained free of infection without antibiotics. Residual aneurysms can cause complications after EVAR.