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Liposarcoma is a tumor that arises from fat tissue. This tumor often occurs in the thigh, behind the knee, or in the abdomen, but it can be found in other parts of the body. Because a liposarcoma may grow into surrounding tissues or organs, it is considered a malignant tumor.
- Sarcoma - Adult Soft Tissue Cancer. American Cancer Society. http://www.cancer.org/Cancer/Sarcoma-AdultSoftTissueCancer/DetailedGuide/sarcoma-adult-soft-tissue-cancer-soft-tissue-sarcoma. Accessed February 14, 2011.