Extraosseous Ewing Sarcoma, also known as extraosseous ewing's sarcoma/peripheral primitive neuroectodermal tumor, is related to ewing sarcoma and sarcoma, and has symptoms including fever An important gene associated with Extraosseous Ewing Sarcoma is CD99 (CD99 Molecule (Xg Blood Group)), and among its related pathways/superpathways are Myogenesis and Pathophysiological roles of DUX4 in FSHD1. The drugs Topotecan and Vincristine have been mentioned in the context of this disorder. Affiliated tissues include spinal cord and bone marrow.