Inclusion Criteria:  Adult patients (age >18 years) Scheduled to undergo elective left colectomy or high rectal resection for cancer with intraperitoneal anastomosis. Signed consent Affiliated to the French social security system (CMU included).  Exclusion Criteria:  Emergent surgery. Rectal cancer requiring total mesorectal excision and anastomosis below the peritoneal reflexion. Colon cancer requiring total or subtotal colectomy defined as a right colectomy extended to the splenic flexure or more). Colon cancer requiring transverse colectomy. Recurrent colorectal cancer. Locally advanced colorectal cancer requiring multi-visceral excision. History of colectomy. Associated concomitant resection of other organ (liver, etc.). Previous pelvic radiotherapy for pathology unrelated to diagnosis with colon cancer e.g. treatment for prostate cancer. Inflammatory bowel disease. History of known allergy to indocyanine. Pregnant patients. Refusal to participate or inability to provide informed consent. Protected adults (individuals under guardianship by court order).