This operation involves the removal of the sigmoid colon, the upper rectum and a variable portion of the left colon. The grey area of the diagram above. The exact margins of resection are at the discretion of the surgeon and are appropriate to each patient and condition treated.
The bowel is freed from its attachments within the abdominal cavity and its blood supply is divided. The bowel is then cut, the diseased segment is removed and the colon and rectum are rejoined with stitches and/or staples.