PMC6037666_01
PMC6037666_02
Colovesicular fistula and intra-abdominal abscess tracking towards the anterior abdominal wall.
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Pathologic evaluation of his sigmoid colon resection revealed acute and chronic diverticular disease with peridiverticular abscess formation (Fig. 5) in the background of chronic active colitis, without evidence of dysplasia or granulomas (Fig. 6).