NF1 and osteosarcoma: The remaining 10/27 MPNSTs were classified in the schwannoma (1 sporadic MPNST), osteosarcoma high grade (1 MPNST in NF1), BCOR-rearranged sarcoma (1 sporadic MPNST), RMS-MYOD1mut (1 sporadic MTT), RMS-like (1 MTT in NF1), and ERMS category (1 MTT in NF1), or did not match any category (4 sporadic MPNSTs).