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    Sarcoma

    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. These tumors are most common in the bones, muscles, tendons, cartilage, nerves, fat, and blood vessels of your arms and legs, but they can happen anywhere.

    Although there are more than 50 types of sarcoma, they can be grouped into two main kinds: soft tissue sarcoma and bone sarcoma, or osteosarcoma. About 12,000 cases of soft tissue sarcoma and 3,000 cases of bone sarcomas were seen in the U.S. in 2014.

    Sarcomas can be treated, often by having surgery to remove the tumor.

    Sarcoma Risk Factors

    We don't yet know what causes sarcoma, but we do know some things that raise the risk of developing one:

    Sarcoma Symptoms

    Soft tissue sarcomas are hard to spot, because they can grow anywhere in your body. Most often, the first sign is a painless lump. As the lump gets bigger, it might press against nerves or muscles and make you uncomfortable or give you trouble breathing, or both. There are no tests that can find these tumors before they cause symptoms that you notice.

    Osteosarcoma can show obvious early symptoms, including:

    • Pain off and on in the affected bone, which may be worse at night
    • Swelling, which often starts weeks after the pain
    • A limp, if the sarcoma is in your leg

    Children and young adults get osteosarcoma more often than adults. And because healthy, active children and teens often have pain and swelling in their arms and legs, osteosarcoma might be mistaken for growing pains or a sports injury. If your child's pain doesn't get better, gets worse at night, and is in one arm or leg rather than both, talk to a doctor.

    Adults who have this kind of pain should see a doctor right away.

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