The multilocular cyst of the Kidney is a rare tumoration, of disputable ethiopatogeny, with typical macroscopic characteristics (looking as honeycomb), but variable histology, generating a lot of synonyms. With the modern image diagnostic methods, these tumors may be suspected pre-operatorily. Previously they were rotulated as probable nephroblastoma (Wilm's tumor). The authors describe the aspects of five cases observed at Pediatric Surgery Services of Getulio Vargas and Lagoa Hospitals of Rio de Janeiro, and University Hospital of João Pessoa (Paraíba). In all of these cases the predominate synptom was a abdominal mass, but one of them also showed arterial hypertension. The five pacients were nephrectomized with a good pos-operatory evolution. In despite of its low incidency, the CMR must be remembered in the diagnosis of any renal mass of infancy, because of favourable diagnosis related to the Wilm's tumor. At adult hood, the differential diagnosis is made mostly with the cystic adenocarcinoma.
Kidney cysts; Wilm's tumor