[A resected case of recurrent carcinoma of the right colon ten years after the initial operation].

A 59 year-old female complained of right lower abdominal mass. She underwent radical operation 10 years ago for the right colonic cancer staged Dukes C. She had passed 10 years without any sign or symptom of recurrence. She noticed a egg-sized tumor in the right lower abdomen unexpectedly one month ago when she got a bruise on that region, and then the tumor grew rapidly. Preoperative examinations, including barium enema, abdominal computerized tomography and so on, suggested a extraluminal tumor with infiltration to the colon. Laparotomy revealed that the tumor originated from the right paracolic gutter. The tumor sized 18 X 11 X 8 cm was resected and histological diagnosis was adenocarcinoma with the similar structural pattern to the initial specimen. On the basis of both operations and histological findings, we concluded that free tumor cells might be implanted in the large raw surface of the right dorsolateral abdominal wall, which was created by surgical incision at the initial operation, and subsequently appeared as a local recurrence after 10 years interval.