Nephroblastoma is one of the most often tumor in children. In concern of Wilm’s tumor it is necessary to provide different analysis and examinations in order to prove diagnosis and clarify the level of dissemination in body. After take answer to question we can start to plan of optimal treatment's tactic. Treatment pathomorphosis is one of the important factor of prognosis. The results of nonadjuvant therapy were analyzed by the depending of pathomorphosis. It gives possibility in each case to clarify the level of tumor progression, adequately chose treatment method and correctly assess prognosis.