MOG antibody associated demyelinating syndrome presenting as aseptic meningitis in a 6-year-old boy.

We describe the case of a 6-year-old boy who developed myelin oligodendrocyte glycoprotein antibody (MOG-Ab) associated demyelinating syndrome, after initially presenting with aseptic meningitis. Magnetic resonance imaging showed cerebral and spinal lesions consistent with acute disseminating encephalomyelitis. Rapid clinical improvement occurred after intravenous high dose methylprednisolone. A small number of cases with MOG-Ab associated demyelinating syndrome presenting as aseptic meningitis have previously been reported in adults, but to our knowledge, this is the first pediatric case of this new clinical phenotype.