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In this article. A sarcoma is a rare kind of cancer. Sarcomas are different from the much more common carcinomas because they happen in a different kind of tissue. Sarcomas grow in connective tissue -- cells that connect or support other kinds of tissue in your body.
Renal sarcoma: renal sarcomas are a rare type of kidney cancer that begin in the blood vessels or connective tissue of the kidney. They make up less than 1% of all kidney cancers. Sarcomas are discussed in more detail in Sarcoma- Adult Soft Tissue Cancer. Benign (non-cancerous) kidney tumors. Some kidney tumors are benign (non-cancerous).