The most common PNSs caused by OT is anti-NMDAR encephalitis (Table 1) (10, 15–39), which is an autoimmune neurological disease characterized by a clinical presentation of encephalitis and the presence of cerebrospinal fluid (CSF) antibodies against the GluN1 subunit of the NMDAR (15). This evidence concerns the gene GRIN1 and viral encephalitis.