MOG and myeloid sarcoma: Recently, the international diagnostic criteria for MOGAD were published (12), and the diagnosis of MOGAD is now made based on the presence of at least one of the core clinical demyelinating events (optic neuritis, myelitis, ADEM, cerebral monofocal or polyfocal deficits, brainstem or cerebellar deficits, and cerebral cortical encephalitis often with seizures), a positive MOG-IgG test, and the exclusion of alternative diagnoses including MS.