Essential segmental myoclonus isolated to the extrinsic laryngeal muscles has not, to our knowledge, been described. We present the first case of this condition and call the phenomenon oscillating larynx. This is also the first report of levetiracetam-responsive segmental myoclonus.
An otherwise healthy 47-year-old man described 15 years of involuntary movements of the larynx without ear clicks. He sought treatment because the movements were increasingly interfering with his ability to get to sleep. While sleep did not abolish the movements, they were visibly reduced according to next-of-kin. There was no disturbance of swallow, speech, or respiration. The movements were not suppressible.
Plummer C, Vogrin S, Cook M, Moses D. Curing of Oscillating Larynx by Levetiracetam. Arch Neurol. 2011;68(8):1075. doi:10.1001/archneurol.2011.168