Nephrogenic adenoma: clinical features and therapeutic considerations.

Nephrogenic adenoma is a benign metaplastic lesion that usually responds to endoscopic treatment. Although occasionally it has been present simultaneously with another malignancy there has been no evidence that a nephrogenic adenoma has ever transformed into a carcinoma. The symptoms of a nephrogenic adenoma can be severe but these lesions can be treated with transurethral surgery. The lesions can occur throughout the bladder and in the urethra. They usually are associated with trauma to the urothelium. Postoperative followup is needed because these lesions tend to have a symptomatic recurrence. An increased awareness of nephrogenic adenoma by urologists and pathologists may lead to its more frequent diagnosis.