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Monochorea after acute contralateral pontine infarction: A case report
Yun Su Hwang1,2, Byoung-Soo Shin1,2, Han Uk Ryu1,2
1Department of Neurology, Jeonbuk National University Medical School and Hospital, Jeonju, South Korea.
Medicine
|January 26, 2023
Summary
This case report details a rare instance of chorea, an involuntary movement disorder, occurring after a stroke in the pons. The patient experienced symptoms in the right arm, which resolved spontaneously, highlighting potential links between pontine lesions and abnormal movements.
Area of Science:
- Neurology
- Neuroscience
- Movement Disorders
Background:
- Chorea is a hyperkinetic movement disorder characterized by involuntary muscle contractions.
- Strokes affecting the basal ganglia are a common cause of chorea, but pontine lesions are rare triggers.
- This report presents a unique case of monochorea following an acute pontine infarction.
Observation:
- A 32-year-old male presented with dysarthria and right hemiparesis.
- MRI confirmed an acute infarction in the left pons.
- Approximately 14 hours post-stroke, the patient developed intermittent, involuntary movements in the right arm, consistent with monochorea.
Findings:
- The patient's chorea symptoms improved spontaneously by day 5 without specific treatment.
- The pontine lesion was suspected to directly affect the corticospinal tract, leading to chorea.
- The exact pathophysiology linking pontine lesions to chorea remains unclear.
Implications:
- This case suggests that direct corticospinal tract lesions in the pons can trigger chorea.
- Further research is needed to elucidate the mechanisms underlying chorea caused by pontine lesions.
- Understanding these mechanisms may offer new insights into motor control and abnormal movement disorders.
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