[Cystic space occupying lesion of the upper pole of the kidney in a newborn infant. Case report and differential diagnosis].

In a newborn female infant a cystic lesion in the upper pole of the right kidney was detected by sonography 4 weeks before an uneventful delivery. In the postnatal period the sonographic examination, IVP, CT, and the biochemical data as well were not able to classify definitely this lesion as a benign cyst, adrenal hemorrhage or cystic malignoma. Therefore a laparatomy was performed, which revealed a cystic neuroblastoma.