A sarcoma is a rare form of cancer that begins in the bones and in the softer connective tissues in the body. Sarcomas that begin in the bones are called "bone cancer," and sarcomas that form in the tissues, including muscle, fat, blood vessels, nerves, tendons, and the lining of joints, are called "soft tissue sarcoma."

There are more than 80 types of soft tissue sarcoma or sarcoma-like growths. Knowing which type you have helps doctors predict how the tumor will respond to specific treatments. It also allows them to personalize your treatment.

These subtypes are generally grouped into two main types of sarcoma: soft tissue sarcoma and bone sarcoma. We have information on some of the subtypes below. You can click here for a full list of sarcoma subtypes. If you prefer your information in print, we have free booklets and factsheets on our online shop.

A sarcoma is a rare kind of cancer that grows in connective tissue -- cells that connect or support other kinds of tissue in your body. WebMD explains the symptoms, causes, and treatment.

Ultra-rare bone sarcomas (BS) are compared with non-ultra-rare BS, illustrating (A) nonultra-rare BS types and (B) the percentage of nonultra-rare BS among all BS. DISCUSSION BS and STS include roughly 100 different pathologic entities, as described in the 2020 WHO sarcoma classification, 9 many of which are ultra-rare.