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Related Experiment Videos

Hemiballism: revisiting a classic disorder.

Ronald B Postuma1, Anthony E Lang

  • 1Morton and Gloria Shulman Movement Disorders Center, Toronto Western Hospital, Ontario, Toronto, Canada.

The Lancet. Neurology
|October 24, 2003
PubMed
Summary

Hemiballism, a rare movement disorder, is often misattributed to subthalamic nucleus lesions. Recent findings reveal a benign prognosis for most hemiballism cases with effective treatments and spontaneous remission.

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Area of Science:

  • Neurology
  • Movement Disorders
  • Neuroscience

Background:

  • Hemiballism is characterized by unilateral, involuntary flinging movements of the limbs.
  • Traditionally, lesions in the subthalamic nucleus (STN) were considered the primary cause.
  • Past perceptions suggested a grave prognosis with significant disability and mortality.

Purpose of the Study:

  • To re-evaluate the traditional understanding of hemiballism.
  • To explore current insights into the pathophysiology and causes of hemiballism.
  • To assess the contemporary prognosis and treatment outcomes for hemiballism.

Main Methods:

  • Review of recent clinical reports and studies on hemiballism.
  • Analysis of neuroimaging findings in hemiballism cases.
  • Investigation into the role of basal ganglia circuitry and novel etiologies.

Main Results:

  • The subthalamic nucleus (STN) is implicated in a minority of hemiballism cases.
  • Most patients experience a benign prognosis with effective treatment and spontaneous remission.
  • New causes identified include non-ketotic hyperosmolar hyperglycaemia and HIV complications.

Conclusions:

  • The traditional view of hemiballism as solely STN-related is outdated.
  • Hemiballism generally has a favorable prognosis, contrasting with historical descriptions.
  • Understanding altered basal ganglia function and identifying diverse causes are crucial for managing hemiballism.

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