DPYSL5 and autoimmune encephalitis: Serum and CSF antibodies tests for autoimmune encephalitis (anti-AMPAR1, AMPAR2, CASPR2, DPPX, GABABR, IgLON5, LGI1, NMDAR) and paraneoplastic syndromes (anti-Hu, Yo, Ri, Ma2/Ta, CV2/CRMP5, and amphiphysin, etc.), and CSF-specific oligoclonal bands were all negative.