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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.
Symptoms of soft tissue sarcoma may include: 1  A painless mass or growth in the leg, buttock, or sometimes on the face or neck. 2  Pain or soreness in the area of the mass caused by the tumor pushing on nerves or muscles.  Limping or other problems with the legs or feet.