PLE-5593

PLE-5593

A previously healthy 60-year-old male presents with sudden, painless massive lower gastrointestinal bleeding. He was immediately brought to a local hospital. In the hospital, the bleeding continued to be massive and persistent. A sigmoid colonoscopy was performed, but it failed to reveal the source of bleeding. The only finding was the presence of multiple outpouchings in the sigmoid colon. Due to the difficulty in localizing and controlling the bleeding, a total colectomy was performed. As the pathologist evaluating the specimen, you discovered multiple outpouchings in the sigmoid colon and tortuous, ectatic submucosal and mucosal vessels in the cecum. What is your diagnosis?