It is a common type of the voltage-gated potassium channel complex (VGKC-complex) antibody encephalitis[1] which is diagnosed mainly by serum/CSF LGI1 antibodies, five core clinical syndromes (facial-brachial dystonia episodes, refractory hyponatremia, cognitive impairment, epilepsy, psychiatric symptoms). This evidence concerns the gene LGI1 and Cognitive impairment.