A 78-year-old man visited another hospital because of epigastric discomfort. There was previous histories of pelvic peritonitis and diverticulitis of the colon. Abdominal ultrasonography revealed cholecystolitiasis. The patient was admitted to the hospital for operation. On admission, the abdomen was soft and flat, and no tumor was palpated on the abdomen. On laboratory examination no inflammatory reaction was noted, and the value of serum CEA (3.3ng/ml) was slightly high. Colonoscopy and Ba enema revealed stenosis in rectosigmoid colon, and a carcinoma of the rectosigmoid colon was susupected, but the definite diagnosis was not made by biopsy. The operative findings showed a granuloma due to a fish bone which stuck in the rectosigmoid diverticulum.
A considerable number of cases of perforation or penetration of the digestive tract due to a fish bone in the literature. This case is believed a rare report that the fish bone penetrated the rectosigmoid diverticulum.