Abstract
The authors report two patients, 6 & 7-year-old boys, with bone metastasizing renal tumor. Histological examination of the tumors demonstrated the typical features of clear cell sarcoma of kidney(CCSK) in case 1, or hyalinizing pattern of CCSK in case 2. Multiple agent chemotherapy including adreamycin seemed to be effective against our patients to a certain extent of their clinical courses, even though they died at approximately 2 years after surgery. For the last 15 years, seven cases of bone metastasizing Wilms' tumor and twenty one of sarcomatous renal tumor(SW), in which the rhabdoid tumors were excluded, had been reported in the Japanese literatures. Only three of them had survived more than five years. Marked male predominancy(M: F=20: 8) of the patients and frequent bone metastases of SW or CCSK were also seen in this series. The appropriate treatments currently being used for patients with those SW were described briefly.
