Tumors of the kidney account for approximately 25% of all (solid) neoplasms in infants and children.1 Renal cell carcinoma had been considered so rare that Gross, in 1953, noted that there had not been a case at Children's Hospital in Boston in 30 yr.2 In the last few years, however, renal cell carcinoma in children has been reported with increasing frequency. A recent case of renal cell carcinoma in a 9-yr-old girl prompted us to review our own past experience with this tumor in children. Three additional cases of hypernephroma were discovered in a review of the records of the past 11 yr. They were previously alluded to by Poole and Viamonte, in their excellent article "Unusual Renal Masses in the Pediatric Age Group."3.
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