[Multilocular benign cystic nephroma. Case report and review of the literature].

The authors report a case of multilocular cystic nephroma. According to the literature this is a rare lesion, which may be diagnosed any time during life, showing the same prevalence in childhood as in adults. Multilocular cystic nephroma is usually an unilateral lesion. Aetiology is unknown and preoperative ultrasonography and roentgenographic studies frequently led to misdiagnosis. Surgical excision of the cyst, with kidney sparing, is the therapy of choice, however nephrectomy is advised when intraoperative biopsy is ambiguous.