LGI1 antibody‐associated limbic encephalitis started from unilateral basal ganglia to medial temporal lobe and insula

Abstract

Leucine‐rich glioma‐inactivated 1 (LGI1) antibody‐associated limbic encephalitis is a rare autoimmune encephalitis. Here, we report a 39‐year‐old woman presented with generalized tonic‐clonic seizures, night delirium, bilateral upper limb tremor, and hyponatremia. Her symptoms did not improve with initial steroid therapy, and brain magnetic resonance imaging (MRI) showed a progression of abnormalities from right basal ganglia to medial temporal lobe and insula. The presence of LGI1 antibodies in the patient's serum confirmed the clinical diagnosis. After the combined treatments of methylprednisolone, plasma exchange, and intravenous immunoglobulin, her clinical symptoms resolved completely.