A pseudotumor of the urinary bladder secondary to diverticulitis of the sigmoid colon with colo-vesical fistula: a case report.

A case of pseudotumor of the urinary bladder secondary to diverticulitis of the sigmoid colon with colo-vesical fistula is reported. Computed tomography and cystoscopy of the granulomatous mass caused by the inflammation suggested a colon or bladder cancer. A transurethral biopsy from the tumor was therefore performed at first, but showed only inflammation. Because primary bladder cancer was ruled out, partial cystectomy and partial colectomy were subsequently performed. Through histological examination the mass proved to be an inflammatory granuloma.