CD4 and myeloid sarcoma: There is a large body of literature implicating CD4+ Th17 cells in the pathogenesis of MS (Brucklacher-Waldert et al., 2009, Cao et al., 2015, Durelli et al., 2009, Kebir et al., 2009, Li et al., 2011, Tzartos et al., 2008).