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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 sarcomas are a rare type of kidney cancer (less than 1% of all kidney tumors) that begins within the kidney's connective tissue. Benign (Non-Cancerous) Kidney Tumors Some types of kidney tumors (including renal cell adenomas, renal oncocytomas and angiomyolipomas) do not usually spread (metastasize) to other parts of the body, although they can still grow and cause problems. 1  Renal Adenoma: 2  Oncocytoma: 3  Angiomyolipoma: