AQP4 and autoimmune encephalitis: Further autoimmune encephalitis panel testing for antibodies to anti-aquaporin 4 (AQP4), anti-myelin oligodendrocyte glycoprotein (MOG), anti-N-methyl-D-aspartate receptor (NMDAR), anti-LGI1, and anti-GABABR in the patient's CSF and serum were negative.