We here describe a case of a sarcoma developing in a patient previously treated with chemotherapy and radiation whose original ependymoma and recurrent sarcoma were both shown to carry the type 1 C11orf95-RELA fusion transcript indicating a monoclonal origin for both tumors.     ///    C11orf95-RELA fusion present in a primary supratentorial ependymoma and recurrent sarcoma.. 