A Case of Necrotizing Obstructive Colitis Due to the Compression of the Rectum by an Iliac Artery Aneurysm

Abstract

Here, we report the case of a solitary left internal iliac artery aneurysm that compressed the rectum, resulting in obstructive necrotizing colitis in the sigmoid colon. A 91-year-old male patient presented with diarrhea and abdominal pain. On computed tomography imaging, a left internal iliac artery aneurysm that was 9 cm in size was observed, and it was compressing the rectum. The sigmoid colon on the oral side of the compressed rectum was markedly dilated, and a colonoscopy showed signs of obstructive colitis. Endovascular treatment of the left internal iliac artery aneurysm and laparoscopic sigmoidectomy were performed. The resected sigmoid colon exhibited necrosis. We deemed this as a rare case of obstructive necrotizing colitis because, to the best of our knowledge, no such cases have been reported to occur due to the compression of the rectum by an iliac artery aneurysm.