AMPH and autoimmune encephalitis: Autoimmune encephalitis was suspected; however, the CSF autoimmune encephalitis panel (this included Anti-Neuronal Nuc Ab, Tp 1, Anti-Neuronal Nuc Ab, Tp 2, Anti-Neuronal Nuc Ab, Tp 3, Anti-Glial Nuclear Ab, Type 1, Purkinje Cell Cyto Ab, Tp 1, Purkinje Cell Cyto Ab, Tp 2, Purkinje Cell Cyto Ab, Tp Tr, Amphiphysin Ab, CRMP-5-IgG, Striated Muscle Aby, P/Q-Type Calcium Channel Aby, N-Type Calcium Channel Aby, AChR Ganglionic Neuronal Aby, and VGKC-Aby) was negative.