Abstract
A 13-month-old boy was referred to Osaka University Hospital becuse of enlarging hard abdominal masses. Image diagnostic findings and an incisional biopsy confirmed a diagnosis of bilateral Wilms' tumor. After the chemotherapy with etoposide, pirarubicin, carboplatin, vincristine and cyclophosphamide, a CT scan revealed a decrease in the size of the left mass with no significant changes of right mass. Then right partial nephrectomy was performed followed by left partial nephrectomy. After all, half of the right kindey and one-theird of the left remained. The histopathological study revealed the definitive diagnosis of bilateral fetal rhabdomyomatous nephroblastoma and the hyperplastic intralobar nephrogenic rest in left kidney. The renal function is well preserved. Eleven months later, he is well and is checked up on regular basis.
