The management of benign renal tumors of infancy. Case report of a congenital mesoblastic nephroma (leiomyomatous hamartoma).

A case of a benign renal tumor found in an infant of 11/2 months is reported. Its clinical, radiological and operative findings were similar to those described previously as Wilms' tumors. Only pathological examination revealed its benignancy. In view of the occurrence of benign congenital mesoblastic nephroma which is evidently not rare in infancy, and because of the side effects of adjuvant cytotoxic and X-ray therapy, the authors feel that the immediate therapeutic approach to a solid intrarenal tumor in infancy should be surgical only. Further therapy should depend on pathological findings.