“…Renal dysplasia, consisting of hamartomas, focal nephroblastomatosis and/or Wilms tumor have been described in several multiple congenital anomalies (MCA) syndromes such as the AGR (aniridia, ambiguous genitalia, mental retardation) syndrome [Riccardi et al, 1978], the Wiedemann-Beckwith syndrome [Reddy et al, 1972], the hemihypertrophy syndrome [Miller et al, 1964], the 18 trisomy syndrome [Bove et al, 1969] and a syndrome of fetal gigantism, nephroblastomatosis and hypertrophy of the endocrine pancreas described by Perlman et al [1973Perlman et al [ , 1975 in a Yemenite Jewish family. Each of these conditions relates to 2 important pathogenetic questions: 1) What is the relationship, if any, between persistence of fetal renal tissue, the presence of malformations, and growth disturbance of prenatal onset; and 2) Is nephroblastomatosis, i.e.…”