There was no evidence of intracranial lesions in brain imaging or OCB, NMOSD (Neuro Myelitis Optica Spectrum Disorder) and MOG antibodies (Myelin oligodendrocyte glycoprotein) in CSF examination; therefore, it was unlikely that the patient had multiple sclerosis (MS), NMO spectrum disorders, or MOG-associated disorders. Here, MOG is linked to myeloid sarcoma.