What is fibrosarcoma?
A person with fibrosarcoma has abnormal bone cells that multiply out of control. These cells can form tumors and spread to other parts of the body. Fibrosarcoma accounts for only 5 percent of bone cancers. It usually occurs in the leg bones of adults over 40 years of age. Risk factors for fibrosarcoma include radiation exposure, Paget disease, fibrous dysplasia, and osteomyelitis. The cause for fibrosarcoma is unknown, but genetics may play a role in determining risk.

What are the symptoms of fibrosarcoma?
Fibrosarcomas usually occur in the knee, thigh or hip, but may also occur in the upper arm. Symptoms of fibrosarcoma include bone pain, swelling overlying the bone, and tenderness overlying the bone. Other symptoms include arm pain, arm tenderness, leg pain, and limping.

How does the doctor treat fibrosarcoma?
Treatment of fibrosarcoma may include radiation therapy, chemotherapy, and surgery.