What should i know about synovial sarcoma and is it a serious cancer?

Can be: A rare form of cancer which usually occurs near to the joints of the arm, neck or leg.Synovial sarcoma occurs most commonly in the young, representing about 8% of all soft tissue sarcomas.Primary treatment for synovial sarcoma is surgery to remove the entire tumor with clear margins when possible. Treatment can involve chemotherapy and radiation. Localized disease has about 70% five year survial.

Also: It can be serious. In addition to what others have said, these tumors were originally named synovial sarcomas since they occur near joints. However, they actually are not related to the synovium, the lining of the joint and the usually do not connect with the synovium itself.