LGI1 and viral encephalitis: Many types of AE have been discovered in recent decades due to the development of biochemical assays; the most common types of neuronal surface antibody (NSAb)-associated AE include anti-N-methyl-D-aspartate receptor (NMDAR), anti-γ-aminobutyric acid B receptor (GABABR), and anti-leucine-rich glioma-inactivated protein 1 (LGI1) encephalitis (3, 4).