There is dilatation of the large bowel within the descending colon with apparent transition point within the sigmoid colon. There is circumferential wall thickening, with irregular mural enhancement, highly concerning for obstructing colon tumor. Just distal to the lesion, there is an air-fluid collection, likely representing contained perforation/abscess. This collection lies between the inferior margin of the sigmoid tumor and the posterior margin of the uterine body. The sigmoid colon and rectum beyond the sigmoid colon mass is decompressed.