Participant Inclusion Criteria  Part 1 (pre-operative):  Diagnosed with primary or recurrent ovarian, fallopian tube, or primary peritoneal cancer Scheduled to undergo debulking or cytoreductive surgery Suspected need for a low anterior rectosigmoid resection at the time of a debulking procedure Enrolled and consented before the operation  Part 2 (intra-operative):  Completed rectosigmoid resection Surgeon plans to perform colorectal anastomosis  Participant Exclusion Criteria  Part 1 (pre-operative):  Documented history of allergic reaction to ICG Not approached for study enrollment before undergoing an unexpected low anterior rectosigmoid resection  Part 2 (intra-operative):  Did not undergo rectosigmoid resection intraoperatively Surgical procedure with rectosigmoid resection for any other type of gynecologic malignancy Patient requires permanent colostomy