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Isolated continuous rhythmic lingual myoclonus.

J M Gobernado1, M Galarreta, G De Blas

  • 1Neurology Service, Ramon y Cajal Hospital, Madrid, Spain.

Movement Disorders : Official Journal of the Movement Disorder Society
|October 1, 1992
PubMed
Summary
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Isolated continuous lingual myoclonus is a rare disorder of tongue movements. This case report details a patient whose lingual myoclonus responded well to sodium valproate treatment.

Area of Science:

  • Neurology
  • Movement Disorders
  • Clinical Case Reports

Background:

  • Isolated continuous lingual myoclonus is an exceptionally rare and poorly understood neurological condition.
  • Characterized by involuntary, rhythmic movements of the tongue, it presents as an independent disorder.
  • Understanding its etiology and effective treatments remains a challenge due to limited documentation.

Observation:

  • A patient presented with non-epileptic, continuous, rhythmical myoclonus affecting the anterior tongue.
  • Electromyography revealed low-frequency (2-4 Hz) activity bursts in the genioglossus muscles.
  • Standard neurological examinations, including EEG and evoked potentials, were normal; brain imaging (CT/MRI) showed no structural abnormalities.

Findings:

  • The patient's lingual myoclonus was diagnosed as an isolated, idiopathic condition.

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  • Diagnostic workup excluded epileptic activity and structural brain lesions.
  • The condition demonstrated a significant positive response to sodium valproate therapy.

    • Implications:

    • This case contributes to the limited understanding of isolated continuous lingual myoclonus.
    • Sodium valproate emerges as a potential therapeutic option for this rare movement disorder.
    • Further research is warranted to elucidate the pathophysiology and explore additional treatment modalities.