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Hypesthetic ataxic hemiparesis in a thalamic lacune
1Department of Neurology, College of Medicine, Seoul National University, Korea.
Stroke
|June 1, 1989
Summary
A lacune in the left thalamus caused right hemiparesis, hypesthesia, and ataxia in a 57-year-old man. This case suggests a link between thalamic lacunes and ataxic hemiparesis pathogenesis.
Area of Science:
- Neurology
- Neuroimaging
- Pathophysiology
Background:
- Ataxic hemiparesis is a clinical syndrome characterized by motor and cerebellar deficits.
- Lacunar infarcts, small ischemic strokes, are common in cerebrovascular disease.
- The thalamus plays a crucial role in motor control and sensory processing.
Observation:
- A 57-year-old male presented with acute onset of right hemiparesis.
- Associated symptoms included ipsilateral hypesthesia (reduced sensation) and ataxia (impaired coordination).
- Magnetic resonance imaging (MRI) revealed a lacune (small infarct) in the left thalamus.
Findings:
- The left thalamic lacune was located adjacent to the medial aspect of the posterior limb of the internal capsule.
- This specific location is critical for motor pathways.
- The imaging findings correlated with the patient's clinical presentation.
Implications:
- The study implicates a specific pathogenetic mechanism for ataxic hemiparesis.
- Thalamic lacunes, particularly those near the internal capsule, can cause this syndrome.
- This highlights the importance of precise lesion localization in understanding neurological deficits.