1. The left ureter was tunneled under the sigmoid mesocolon towards the right lower abdomen.

2. The upper of mesorectum follows the sigmoid mesocolon, the inferior extremity attaches the junction of anorectum and becomes thin.

3. Transverse colon and transverse mesocolon was resected in 14 patients, exite of left liver in 2 patients and pancraticoduodenectomy in 3 patients.

4. Anterior lobe of transverse mesocolon and pancreatic capsule should be peeled, and radical resection of Omental bursa should be considered as routine operation in these patients.

5. The sigmoid mesocolon is a peritoneal fold attaching the sigmoid colon to the pelvic wall. The apex is divided near the left common iliac artery and series as a potential site for an internal hernia.

6. The sigmoid mesocolon is a peritoneal fold attaching the sigmoid colon to the pelvic wall. The apex is divided near the left common iliac artery and serves as a potential site for an internal hernia.

7. Laceration of the colonic serosa or mesocolon complicated by colonoscopy is rare but probably overlooked.http://

8. Mesentery is one of the important structure of peritoneal cavity, which includes mesentery of small intestine, transverse mesocolon and sigmoid mesocolon.

9. Results: The abdominal segment of the left ureter ran medially and was close to the left mesocolon .

10. Purpose:To investigate the value of CT in the diagnosis of spread of disease via the subperitoneal space of the broad ligament and sigmoid mesocolon in the pelvis.