Management of synchronous bilateral Wilms tumor: Brazilian Wilms Tumor Study Group experience with 14 cases. Brazilian Wilms Tumor Cooperative Group, Sao Paulo, Brazil.

The Brazilian Wilms Tumor Study Group has registered 16 cases of synchronous bilateral Wilms tumor since 1986, of which 14 were available for analysis. Most patients were treated according to a prospective trial in which bilateral renal preservation was emphasized. Overall survival was 79% (11 of 14 cases), and both kidneys were preserved in 57% (8 of 14) of the patients with synchronous disease. Of the 14 patients 5 had undergone at least 3 surgical procedures. In 10 cases in which pathological reports were available for review residual disease was documented in 5 but none had relapse.