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 also happen in other areas of your body..
Although there are more than 50 types of sarcoma, there are two main forms: soft tissue sarcoma and bone sarcoma, or osteosarcoma. In the U.S., about 3,500 new cases of osteosarcoma were diagnosed in 2018; in 2019 there will be an estimated 12,750 new cases of soft tissue sarcoma.
Sarcomas can be treated, often by having surgery to remove the tumor.