[Multilocular cysts. An entity of difficult classification. Apropos of two cases]

Renal multilocular cyst continues to be, up-to-date, an entity of unknown pathoetiology. In many occasions, particularly in children, it has been mistaken with a partially differentiated cystic nephroblastoma. Due to the absolute benignancy of the multilocular cyst and the likelihood of preserving the renal parenchyma, we consider of interest to contribute a brief review of the current pathoetiological theories and clinical development, as well as our experience in this disease.