Primary localized amyloidosis of urinary bladder.

Primary localized amyloidosis of the bladder is rare. Two new cases are presented, and 44 cases from the literature are reviewed. The disease tends to occur in a younger age group in men than in women. It presents most frequently with gross painless hematuria, and usually appears at cystoscopy as a tumefied, yellowish, and occasionally ulcerated lesion. The amyloid deposits usually involve suburothelial connective tissue, suburothelial vessels, and less markedly the vesical muscularis. The treatment varies from transurethral resection to total cystectomy with urinary diversion. Transurethral resection appears to be the treatment of choice, if feasible. Close follow-up of the patient is necessary because of the frequency of multiple recurrences, which may require an ablative procedure.