Hemimasticatory spasm (HMS)
Written and reviewed by Dr Ibrahim Imam, Consultant Neurologist. Last reviewed .
Hemimasticatory spasm (HMS). This results from microvascular compression of the trigeminal motor nerve. Fully referenced neurology checklist.
Pathology
- This results from microvascular compression of the trigeminal motor nerve
- This is usually by the superior cerebellar artery
Secondary causes
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Clinical features
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Triggers
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Complications
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Electromyography (EMG)
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Treatment
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References
- Radhakrishnan DM, Goyal V, Shukla G, Singh MB, Ramam M. Hemi masticatory spasm: series of 7 cases and review of literature. Mov Disord Clin Pract 2019; 6:316-319.
- Kim JH, Han SW, Kim YJ, Kim J, Oh MS, Ma HI, Lee BC. A case of painful hemimasticatory spasm with masseter muscle hypertrophy responsive to botulinum toxin. J Mov Disord 2009; 2:95-97.
- Tavadyan ZD, Yeghiazaryan NS, Khachatryan SG. Hemimasticatory spasm: the first case report of bilateral presentation. Mov Disord Clin Pract 2021; 8:775-777.
- Chen GC, Chen MJ, Wei WB, Hao YB. Parry-Romberg syndrome with hemimasticatory spasm: a rare combination. J Craniofac Surg 2020; 31:e205-e208.
- Woo KA, Kim HJ, Park H, Jeon B. Bilateral Hemimasticatory spasm in a patient with hypereosinophilic syndrome. Parkinsonism Relat Disord 2021; 93:55-57.
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