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A New Management Strategy for Hemimasticatory Spasm.

Zhongding Zhang¹, Datan Lu², Tingting Ying¹

¹Department of Neurosurgery, Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Yangpu District, Shanghai, People's Republic of China.

Journal of Neurological Surgery. Part A, Central European Neurosurgery

|November 20, 2024

Summary

Highly selective trigeminal motor root rhizotomy (HSTR) effectively treats hemimasticatory spasm (HMS), a rare trigeminal nerve disorder. Surgical intervention significantly alleviates symptoms with minimal complications, offering a promising treatment strategy.

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Area of Science:

Neurology
Neurosurgery
Movement Disorders

Background:

Hemimasticatory spasm (HMS) is an uncommon unilateral movement disorder affecting mastication muscles.
The underlying mechanisms of HMS remain unclear, necessitating effective treatment development.

Purpose of the Study:

To investigate the clinical characteristics of HMS.
To evaluate the efficacy of surgical treatment for HMS.

Main Methods:

Retrospective analysis of 12 HMS patients.
Surgical intervention involved highly selective trigeminal motor root rhizotomy (HSTR), with or without microvascular decompression.

Main Results:

Nine patients achieved uneventful recovery with no residual spasms.
Two patients experienced complete symptom resolution within 3 months post-surgery.
One patient had symptom recurrence 2 years after initial improvement.

Conclusions:

HSTR is a safe and effective surgical procedure for managing hemimasticatory spasm.
Surgical intervention significantly alleviates HMS symptoms with low complication rates.