A mesoblastic nephroma is the most common renal tumor identified in the neonatal period and the most frequent benign renal tumor in childhood. It represents 3-10% of all pediatric renal tumors. This tumor was first described as a separate entity by Bolande et al in 1967. Prior to this, it was erroneously confused with congenital Wilms tumor.

A mesoblastic nephroma is the most common renal tumor identified in the neonatal period and the most frequent benign renal tumor in childhood. It represents 3-10% of all pediatric renal tumors. This tumor was first described as a separate entity by Bolande et al in 1967. Prior to this, it was erroneously confused with congenital Wilms tumor.