CNTNAP2 and autoimmune encephalitis: CNS: central nervous system, CSF: cerebrospinal fluid, WBC: white blood cell count, MRI: magnetic resonance imaging, FLAIR: fluid-attenuated inversion recovery, EEG: electroencephalogram, AE: autoimmune encephalitis, NMDAR: N-methyl-D-aspartate receptor, LGI1: leucine-rich glioma-inactivated protein 1, CASPR2: contactin-associated protein-2, AMPAR: alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor, GABA: γ-aminobutyric acid