T‐cell mediated immunity plays a pivotal role in MS pathogenesis [2], with autoimmune T‐cell responses to myelin proteins, including myelin basic protein (MBP) [3], myelin oligodendrocyte glycoprotein (MOG) [4] and proteolipid protein (PLP) [5], being central to disease progression. Here, MBP is linked to myeloid sarcoma.