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Masticatory spasm in facial hemiatrophy

Annals of Neurology

|June 1, 1980

Summary

Facial hemiatrophy can lead to spontaneous masseter muscle spasms years later. Electromyography revealed nerve injury activity in the trigeminal nerve, similar to hemifacial spasm.

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Area of Science:

Neurology
Neuroscience
Trigeminal Nerve Disorders

Background:

Facial hemiatrophy is a rare condition characterized by wasting of facial tissues.
Hemifacial spasm typically involves involuntary contractions of facial muscles.

Observation:

A young woman developed spontaneous left masseter muscle spasms six years after facial hemiatrophy onset.
A dental procedure preceded the facial wasting by four weeks.

Findings:

Electromyographic findings showed brief bursts of potentials up to 200 Hz, characteristic of hemifacial spasm.
These findings indicate spontaneous nerve activity in trigeminal nerve-innervated muscles following injury.

Implications:

This case suggests a potential link between trigeminal nerve injury and secondary spasm development.
Understanding this mechanism could inform diagnosis and treatment of facial spasms and hemiatrophy.