OMG and autoimmune encephalitis: We did not routinely check for the presence of anti-N-methyl-D-aspartate receptor or anti-myelin oligodendrocyte glycoprotein antibodies in the CSF of each patient because none with AED had neuroimaging findings suggestive of acute disseminated encephalomyelitis or multiple sclerosis as defined by the criteria of the International Pediatric Multiple Sclerosis Group in 2013, such as multiple high-intensity lesions in ADC, or clinical features typical of autoimmune encephalitis, such as orofacial or limb dyskinesias, choreoathetosis, or dysautonomia.