The large bowel is obstructed by a sigmoid colon stricture. There is circumferential thickening, with no diverticula in this segment, and the impression of shouldered edges at the proximal end of the stricture. Some adjacent peritoneal thickening is present. A few lymph nodes are seen in the vicinity but not particularly enlarged. This segment of the colon appears to be adherent to the left ovary. No adherence to other structures is identified. A small volume of free fluid is noted adjacent to the caecum. Air in the caecal wall is concerning for developing ischaemia. No bowel perforation. No liver or lung abnormalities.
The lack of diverticula, relatively short stricture, and apparent shouldered edges makes this highly concerning for a malignant stricture.