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    Adult Soft Tissue Sarcoma Treatment (PDQ®): Treatment - Patient Information [NCI] - General Information About Adult Soft Tissue Sarcoma

    Adult soft tissue sarcoma is a disease in which malignant (cancer) cells form in the soft tissues of the body.

    The soft tissues of the body include the muscles, tendons (bands of fiber that connect muscles to bones), fat, blood vessels, lymph vessels, nerves, and tissues around joints. Adult soft tissue sarcomas can form almost anywhere in the body, but are most common in the head, neck, arms, legs, trunk, and abdomen.

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    There are many types of soft tissue sarcoma. The cells of each type of sarcoma look different under a microscope, based on the type of soft tissue in which the cancer began.

    See the following PDQ summaries for more information on soft tissue sarcomas:

    Having certain inherited disorders can increase the risk of adult soft tissue sarcoma.

    Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. Talk with your doctor if you think you may be at risk. Risk factors for soft tissue sarcoma include the following inherited disorders:

    Other risk factors for soft tissue sarcoma include the following:

    • Past treatment with radiation therapy for certain cancers.
    • Being exposed to certain chemicals, such as Thorotrast (thorium dioxide), vinyl chloride, or arsenic.
    • Having swelling (lymphedema) in the arms or legs for a long time.

    A sign of adult soft tissue sarcoma is a lump or swelling in soft tissue of the body.

    A sarcoma may appear as a painless lump under the skin, often on an arm or a leg. Sarcomas that begin in the abdomen may not cause signs or symptoms until they get very big. As the sarcoma grows bigger and presses on nearby organs, nerves, muscles, or blood vessels, signs and symptoms may include:

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