Conclusions The results suggested that the genesis of nephroblastoma is relevant to the retarded differentiation of fetal kidney.NR is the precursor lesion of nephroblastoma.

• 结论肾母细胞瘤的发生与胚胎肾分化停滞有关，肾源性剩余可能是肾母细胞瘤的前期病变。