Soft tissue sarcoma is a type of cancer that develops in the soft tissues of the body, such as muscles, tendons, and fat. The exact cause of soft tissue sarcoma is unknown, but potential risk factors include exposure to certain chemicals, radiation therapy, and certain genetic conditions. Symptoms of soft tissue sarcoma may include a painless lump or swelling in the affected area, and as the cancer progresses, it may cause pain, weakness, and difficulty moving the affected body part. Diagnosis typically involves imaging tests and biopsy, and treatment may involve surgery, radiation therapy, and chemotherapy, depending on the stage and characteristics of the cancer.

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