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Monochorea caused by a striatal lesion.
1Department of Medicine, Asahi General Hospital, Chiba, Japan.
European Neurology
|January 1, 1991
Summary
Monochorea, or involuntary arm movements, can signal a striatal lesion. This case highlights how localized brain damage, specifically in the caudate nucleus, can manifest as restricted choreic movement.
Area of Science:
- Neurology
- Neuroscience
- Radiology
Background:
- Chorea is characterized by involuntary, irregular, and purposeless movements.
- Monochorea, affecting a single limb, is a less common presentation of hyperkinetic disorders.
- Striatal lesions are frequently implicated in the pathophysiology of chorea.
Observation:
- A 76-year-old male presented with choreic movements exclusively affecting his arm.
- Neuroimaging, specifically computed tomography (CT), was performed to investigate the cause.
- The CT scan revealed evidence of an old infarction.
Findings:
- The infarction was predominantly located in the head of the right caudate nucleus.
- This finding suggests a direct correlation between the striatal lesion and the observed unilateral chorea.
- The somatotopic organization within the basal ganglia may explain the localized motor symptoms.
Implications:
- Monochorea can serve as a clinical indicator of focal striatal pathology.
- Understanding the somatotopic mapping within the caudate nucleus is crucial for diagnosing movement disorders.
- This case underscores the importance of neuroimaging in localizing the neurological substrate of specific movement abnormalities.