How is tx of sarcomas of the kidney?

- Sarcomas represent 1% to 2% of all malignant renal tumors in adults -Specific findings suggestive of sarcoma rather than RCC include apparent origin from the capsule or perisinuous region, growth to large size in the absence of lymphadenopathy, presence of fat or bone suggestive of liposarcoma or osteosarcoma, and hypovascular pattern on angiography, although one notable exception is the hemangiopericytoma, which is highly vascular -Leiomyosarcoma is the most common histologic subtype of renal sarcoma, accounting for 50% to 60% of such tumors