Abstract
Urothelial cell carcinomas represent the vast majority of urinary bladder tumors. However, many inflammatory and non-neoplastic conditions can mimic a urinary bladder malignancy. In that matter, diverticulitis can progress into colovesical fistula formation with a bladder wall abscess that can mimic a pseudo mass. Nonetheless, the presence of a bladder wall mass, usually requires pathologic examination. We report the case of a 60 year old woman with recurrent urinary infections due to a focal bladder mass revealing a colovesical fistula as a complication of sigmoid diverticulitis.