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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.
1 Kaposi sarcoma is a disease in which malignant tumors (cancer) can form in the skin, mucous membranes, lymph nodes, and other organs. 2  Tests that examine the skin, lungs, and gastrointestinal tract are used to detect (find) and diagnose Kaposi sarcoma.