Anti-LGI1 Antibody Encephalitis Mimicking Jumping Stump Syndrome

Jumping stump syndrome is considered to be a peripherally induced movement disorder due to damage to peripheral nerves leading to dystonia or myoclonus. Anti-leucine-rich glioma-inactivated 1 antibody (anti-LGI 1 Ab) encephalitis is clinically characterized with progressive cognitive dysfunction and seizure including facial brachial dystonic seizure. We report a case of a woman with a history of intractable involuntary movement on amputated forearm diagnosed as anti-LGI 1 Ab encephalitis, mimicking symptoms of jumping stump syndrome.