Malignant (cancerous) tumors of the connective tissues are called "sarcomas." As cancers of the connective tissue, sarcomas develop fat, blood vessels, nerves, bones, muscles, deep skin tissue, tendons and cartilage. Sarcomas are divided into two main groups - bone tumors and soft tissue tumors. They are further classified based on the type of cell found in the tumor, although all sarcomas share certain microscopic characteristics and have similar symptoms.
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