Adult pseudosarcoma of the bladder

Pseudosarcomatous tumor of the urinary bladder is an unusual benign proliferative lesion that poses a diagnostic dilemma for both the urologist and pathologist. Its clinical and histologic features mimic a malignant neoplasm, although simple excision is curative. Although similar lesions have been reported in multiple extravesicle locations, most commonly the lung, bladder lesions have only recently been reported. We describe 2 cases of pseudosarcomatous bladder tumors presenting in patients with no known risk factors. We review clinical, histologic, and management issues in these patients. By recognizing the existence of this lesion, possible extensive and inappropriate surgery may be avoided.