1. This may explain the predominance of rectosigmoid cancers detected by faecal occult blood testing.

2. The treatment of choice for rectal and rectosigmoid cancer is complete surgical resection.

3. In all intestinal stricture cases, partial ileal resection was performed in 14 patients, right hemicolectomy in 1 patient, rectosigmoid resection in 3 patients.

4. Barium enema examination (1 case), demonstrated elongated and narrowed rectosigmoid .

5. Conclusions: In patients with UC, the lesions arc mainly located at rectosigmoid colon and most of them are mild or moderate, extra-intestinal manifestations and complications are rare.

6. Good specificity associated with a lower sensitivity was obtained in the diagnosis of deep endometriosis of uterosacral ligaments, rectosigmoid involvement or anterior deep endometriosis.

7. In 64% of the specimens, the marginal artery extends to the rectosigmoid arterial zone.

8. The number of mast cells in the ileocecal and rectosigmoid junctions increased with no statistical significance in patients with active and nonspecific colonitis.

9. Conclusions: In patients with UC, the lesions are mainly located at rectosigmoid colon and most of them are mild or moderate, extra-intestinal manifestations and complications are rare.