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A sarcoma is a type of cancer that develops from certain tissues, like bone or muscle. Bone and soft tissue sarcomas are the main types of sarcoma. Soft tissue sarcomas can develop from soft tissues like fat, muscle, nerves, fibrous tissues, blood vessels, or deep skin tissues.They can be found in any part of the body.here are many types of soft tissue tumors, and not all of them are cancerous. When the term sarcoma is part of the name of a disease, it means the tumor is malignant (cancer). Some soft tissue tumors behave in way in between a cancer and a non-cancer.
Fibrous dysplasia is a rare bone disorder in which scar tissue develops in place of normal bone tissue, thereby weakening the bone. The most common bones affected by this disease are skull and facial bones, thighbone, shinbone, pelvic bones, ribs, and upper arm bone.ibrous dysplasia is a rare bone disorder in which scar tissue develops in place of normal bone tissue, thereby weakening the bone. The most common bones affected by this disease are skull and facial bones, thighbone, shinbone, pelvic bones, ribs, and upper arm bone.