Mutations in torsion dystonia (DYT)1 (TOR1A encoding torsion (Tor)A, Online Mendelian Inheritance in Man [OMIM] ID: 605204) and DYT6 (THAP1 encoding THAP domain-containing 1, OMIM ID: 609520) often affect the craniocervical muscle and may contribute to the pathophysiology of MS (87–89). This evidence concerns the gene TOR1A and myeloid sarcoma.