Sarcoma is a rare type of cancer that develops in the bones and soft tissues. Soft tissue refers to fat, muscle, blood vessels, nerves, deep skin tissue, and fibrous tissue.
Most cases of sarcoma have no known cause, although there are several factors that can increase a person's risk of developing the cancer. Early signs of soft tissue Sarcoma can include a painless lump or swelling. Some cases may not cause any symptoms until they grow and press on nearby nerves, organs or muscles.