Abstract
A 41-year-old woman was admitted to the hospital for close exploration of a tumor prolapsed from the anus. Barium enema and colonoscopy revealed a submucosal tumor with the diameter of 5cm and smooth surface in the sigmoid colon. Abdominal CT scan showed a tumorous lesion containing honeycomb like aerogram at the left side of the pelvic space. Although the definite diagnosis was not made, laparoscopy assisted surgery was performed. At surgery, the soft and well-defined mass was present in the sigmoid colon at the mesocolon. Histopathological study showed the cystic lesion communicating with normal lumina via a small hole which contained stool. The cystic wall was lined with mucosa similar to the large intestine and smooth muscle layer. These findings indicated colonic duplication. Alimentary tract duplication in adult is rare, so that the correct preoperative diagnosis of the disease is not easily made. Laparoscopy assisted surgery, which has not seen attempted before this case, seems to be a useful treatment of colonic duplication.
