WT1 and Nephroblastoma: Solid pRCC “type I”: CK7(+), AMACR(+), WT-1(−), CD57(−)Metanephric adenoma: CK7(−)/isolated cells, AMACR(−), WT-1(+, nuclear), CD57(+)Wilms’ Tumor: CK7(−)/isolated cells, AMACR(−), WT-1(+, nuclear), CD57(−)