Anti-LGI1 Antibody-Positive Autoimmune Encephalitis Presenting with Electrographic Seizures: A Clinical Case Report

A 59-year-old woman with behavioral changes, memory impairment, and hyponatremia was diagnosed with LGI1 antibody-positive autoimmune encephalitis after brain MRI revealed temporal lobe involvement and EEG showed electrographic seizure patterns. Treatment with steroid pulse therapy, plasma exchange, and lacosamide resulted in lesion resolution within 90 days, highlighting the importance of EEG monitoring for early detection of autoimmune encephalitis.