[Nephrogenic adenoma: study of 9 cases, including one of the urethra in a 14-year-old male]

To review our series of nephrogenic adenoma and compare our results with those reported in the literature.The records of our Department of Pathology were reviewed to determine the cases of nephrogenic adenoma diagnosed at our center. The clinical features, diagnostic aspects, pathological findings, treatment and outcome are presented.Nephrogenic adenoma is a rare lesion, probably arising from nephrogenic metaplasia caused by injury to the urothelial mucosa. The site of presentation is frequently the bladder, followed by the urethra. The diagnosis is based on the histopathological findings, which can be occasionally equivocal. The cases described in the present series were benign. To date there is no established therapeutic approach. We performed TUR in two patients, antibiotic therapy was administered in one patient and 4 patients were managed conservatively. Two of our patients had no control evaluation following biopsy of the lesion. In 2 of the 4 patients that were managed conservatively, the lesion remitted spontaneously.