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Diverticulosis of the sigmoid colon with numerous diverticula and smooth circumferential muscle thickening. Focal thickening of mid-sigmoid with anterior soft tissue extension to the left anterolateral bladder wall, with gas within a pocket in the bladder wall and gas within the lumen too. Adjacent peritoneal thickening. No signs of free perforation. No signs of ascending urinary tract infection. Findings consistent with colovesical fistula.