Nephrogenic adenoma of the bladder.

Nephrongenic adenoma is a rare, apparently benign lesion of the bladder, occuring predominantly in young male subjects. Although it may occur spontaneously several cases have developed after trauma to the bladder. Histologically the lesion consists of tubules lined by a single layer of cuboidal or columnar epithelium resembling renal tissue and should be regarded as an unusual form of metaplasia of the bladder urothelium. Treatment by parenteral administration of broad-spectrum antibotics and diathermy excision has produced satisfactory results. Long-term followup is recommended.