32 of the retroperitoneals tumors , either intrarenals or extrarenals , observed in infancy and childhood were wilm 's tumor , 22 neuroblastoma , 5 hydronephrosis , 2 multicystic kidney , 1 policystic kidney , 2 pancreatic cyst and 1 biliar cyst .
C0027651
tumors
C0010709
cyst