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Geniospasm: hereditary chin trembling

A Danek1

  • 1Neurologische Klinik, Ludwig-Maximilians-Universität München, Germany.

Movement Disorders : Official Journal of the Movement Disorder Society
|July 1, 1993
PubMed
Summary

Geniospasm is a rare, inherited chin trembling disorder, often triggered by stress. This study details new cases, highlighting its autosomal-dominant inheritance pattern and distinguishing it from other tremors.

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Area of Science:

  • Neurology
  • Genetics
  • Rare Diseases

Background:

  • Geniospasm is a rare hereditary disorder causing involuntary chin trembling.
  • First described in 1894, it affects families across Europe and the USA.
  • Understanding its genetic basis and clinical presentation is crucial for diagnosis.

Observation:

  • Presents three new cases of Geniospasm from two distinct families.
  • Observed episodic, stress-induced involuntary chin trembling as the primary symptom.
  • Ruled out other neurological abnormalities, though rare EEG and sleep disturbances have been noted.

Findings:

  • Geniospasm follows an autosomal-dominant inheritance pattern with high penetrance.
  • Confirmed the hereditary nature of the disorder in newly identified families.
  • Distinguished Geniospasm from similar conditions like facial myokymia and essential tremor.

Implications:

  • Highlights the need for accurate differential diagnosis of Geniospasm.
  • Suggests further research into the neurophysiological and molecular underpinnings of the disorder.
  • Emphasizes the importance of genetic counseling for affected families.

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