2016 Volume 41 Issue 4 Pages 652-657
A 66-year-old man was referred to our hospital due to abnormal findings following a chest X-ray examination. Subsequent chest computed tomography showed a tumor in the abdominal cavity. Abdominal computed tomography showed a 3 cm, poorly enhanced cystic tumor with calcification in the transverse mesocolon, which was fed by the middle colic artery. Further radiological examinations or a gastrointestinal endoscopy could not clearly diagnose the tumor. The patient underwent laparoscope-assisted tumor resection. Gross features showed the tumor was 39 mm in diameter and contained mucous. Microscopically, mucous epithelium and smooth muscle was found in the wall of the tumor, that was evaluated as colorectal component. However, the tumor did not connect to the normal gastrointestinal tract. Finally, we diagnosed the tumor as duplication of the transverse colon. Duplication of the colon in adults is relatively rare, and preoperative diagnosis is quite difficult. Laparoscopic surgery of duplication of the alimentary tract has been reported in several cases. Here we report a case of duplication of the transverse colon resected by laparoscope-assisted surgery.
