The association of Wilms' tumor with second primary malignancies.

Medulloblastoma occurs uncommonly in the neonatal period. Metastatic Wilm's tumor in a newborn is extremely rare. The coincidence of these two neoplasms in one infant, and an equally uncommon combination of Wilms' tumor and a cerebellar medulloephithelioma in another child prompted this report. The authors speculate on the mechanism of oncogenesis in these and other infants with neonatal malignancies.