Diffuse cavernous hemangioma of the rectum and sigmoid colon.

We present an 18-year-old man with painless rectal bleeding, hematuria and diffuse cavernous hemangioma of the rectum and sigmoid colon. Thirty units of blood were transfused during the interval preceding definitive surgery. Low anterior resection and partial cystectomy were performed. During the postoperative period no rectal bleeding occurred, but he died of massive intracerebral bleeding 10 months after the operation.