TrEnd trial is aimed to collect data from consecutive patients undergoing segmental sigmoid colon/rectal resection for deep endometriosis. The main purpose of this project is to gather a large series of cases treated using standardized surgical procedures, allowing a precise evaluation of complications and long-term outcomes.

Inclusion Criteria:

• age >/= 18 years;
• presence of deep endometriotic nodule(s) infiltrating the tunica muscularis of the sigmoid colon/rectum.

Exclusion Criteria:

• age <18 years:
• presence of coexisting inflammatory bowel disease;
• patients who have received previous pelvic radiotherapy.

Women undergoing segmental sigmoid colon/rectal resection for deep endometriotic nodules infiltrating the tunica muscularis of the sigmoid colon/rectum preoperatively identified with imaging and surgically treated with segmental resection