[Nephroblastomatosis: a precancerous condition of Wilms' tumor]

Nephroblastomatosis is a precursor of Wilms' tumor. In this paper we report on a child with bilateral nephroblastomatosis. Although ultrasound and computed tomography showed extensive lesions, especially in the left kidney, no Wilms' tumor tissue was found histologically. Both kidneys regressed to normal size after chemotherapy.