CNTNAP2 and autoimmune encephalitis: The serum and CSF were negative for paraneoplastic autoantibodies, including Hu, Ri, Yo, amphiphysin, CV2 and Ma2, as well as for autoimmune encephalitis-related antibodies such as alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR), gamma-aminobutyric acid beta receptor (GABABR), contactin-associated protein-like 2 (CASPR2), and leucine-rich glioma inactivated protein 1 (LGI1).