Abstract
A74-year-old female was admitted to our hospital with abdominal pain. Barium enemarevealed a elevated tumor at the rniddle of ascending colon. Colonoscopy revealed a well-defined tumor, 2cm in size with erosion and villous part on its surface. There was a depressedarea with normal mucosa close to the tumor. We categorized it as type 5 tumorl We diagnosedit as a colon can.cer on biopsy and the right hemicolectomy was performed. On pathological findings, the tumor was arisen frorn the wall of colonic diverticulum and grew in the rnucosal layer. No lymph node rnetastasis was shown in the specimen. Thediverticulum possessed the layer of muscularis prcpria which way strectched and thinned dwvnby the tumor. Because of the existence of the layer of muscularis propria we regard thisdiverticulum as true diverticulum. Four cases of colonic cancer arising from the diverticulum, have been reported in the worldliterature since Cohn KH et a1. reported in 1993. We report herein the fifth case of colon cancerarising frorn a divertlculum.
