Sarcomas are a group of cancers that arise in the bones and soft tissues like muscles, fat, and connective tissues. When you hear sarcoma, you might think of bones, but there's more to the story. These two main types—bone sarcomas and soft tissue sarcomas—each have their own tales to tell. Although both bone sarcomas and soft tissue sarcomas are uncommon malignancies that arise in the body, they differ in their origins and the typical age at which they are diagnosed.