Congenital mesoblastic nephroma in a premature neonate with initial presentation of hematuria – A case report with review of literature

Congenital mesoblastic nephroma (CMN) is a rare tumor of infancy and consists of 3%–10% of cases among all the pediatric renal tumors. Histologically, it can be classic, cellular, and mixed subtypes, with the cellular variant being difficult to differentiate from Wilms tumors and more aggressive. In this report, macroscopic hematuria was noticed first, and a right renal mass was detected in a 32-week-old premature female neonate, who was born to a 30-year-old woman by emergency cesarean section. Nephrectomy was performed, and histopathological examination of the operated specimen revealed features of cellular variant of CMN.