What is the definition or description of: ewing's sarcoma?

Primary Sa of Bone: Ewing’s sarcoma, typically starts in the long bones, but can start in other tissues and muscles as a primitive neuroectodermal tumor. It is the third most common primary bone cancer occurring most frequently in children and teenagers. Treatment consists of neoadjuvant chemotherapy, with vincristine, doxorubicin, and cyclophosphamide following surgical resection. 5 yr. survival > 80%