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Updated: May 7, 2026
08:25
Circumscribed Capsular Infarct Modeling Using a Photothrombotic Technique
Published on: June 2, 2016
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Pseudoperipheral palsy due to infarction in the internal capsule
Hiroki Masuda1, Shoichi Ito, Shigeyuki Kojima
1Department of Neurology, Matsudo City Hospital, Japan.
Internal Medicine (Tokyo, Japan)
|October 16, 2013
Summary
Lacunar infarctions rarely cause pseudoperipheral palsy. This case reveals hand fiber topography in the internal capsule, linking specific infarct locations to hand movement deficits.
Area of Science:
- Neurology
- Neuroscience
- Radiology
Background:
- Pseudoperipheral palsy is typically caused by cerebral cortical infarctions.
- Lacunar infarctions, particularly in the posterior limb of the internal capsule, are an uncommon cause.
- The precise somatotopic organization of the corticospinal tract within the posterior limb of the internal capsule is not well-established.
Observation:
- An 81-year-old Japanese woman presented with a characteristic left hand drop.
- Brain magnetic resonance imaging (MRI) identified an acute lacunar infarction.
- The lesion was located in the anteromedial portion of the inferior level of the right internal capsule's posterior limb.
Findings:
- The specific location of the infarction correlated with the patient's hand motor deficit.
- This case provides direct evidence for the topographical organization of corticospinal tract fibers controlling hand movements within the internal capsule.
Implications:
- This finding helps elucidate the detailed neuroanatomy of the corticospinal tract.
- Understanding this topography can improve the diagnosis and localization of lesions causing motor impairments.
- It contributes to the understanding of lacunar stroke syndromes affecting fine motor control.
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