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Limbic encephalitis has been reported usually as an autoimmune complication related to onconeuronal antigen of underlying cancer with poor prognosis. Antibodies reactive with neuronal voltage-gated potassium channels (VGKCs) are recently recognized as a pathogenic cause in nonparaneoplastic limbic encephalitis, which is responsive to immunotherapy. We report a patient who had subacute encephalopathy with clinical and radiographic evidences of limbic encephalitis. The patient was seropositive for VGKC antibodies and resulted in a good prognosis with steroids. This has not yet been reported in Korea.