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Peduncular hallucinosis associated with posterior thalamic infarction
J Serra Catafau1, F Rubio, J Peres Serra
1Department of Neurology, Hospital de Bellvitge Princeps d'Espanya, Barcelona.
Journal of Neurology
|February 1, 1992
Abstract:
Peduncular hallucinations are generally associated with lesions of the midbrain. We describe a 68-year-old man who developed left hemiparesis, paraesthesias on the left side and vivid visual hallucinations, suggesting peduncular hallucinosis. MRI demonstrated a right posterior thalamic infarct as the sole lesion.
Insights
Peduncular hallucinations typically indicate midbrain lesions. This case reveals a posterior thalamic infarct causing similar symptoms, challenging the conventional understanding of hallucinosis localization.
Area of Science:
- Neurology
- Neuroimaging
- Neuroscience
Background:
- Peduncular hallucinations are classically linked to lesions in the midbrain.
- Understanding the neuroanatomical basis of specific neurological symptoms is crucial for diagnosis.
Observation:
- A 68-year-old male presented with left hemiparesis, left-sided paresthesias, and vivid visual hallucinations.
- The symptom cluster suggested peduncular hallucinosis.
Findings:
- Magnetic Resonance Imaging (MRI) revealed a right posterior thalamic infarct as the only brain lesion.
- This finding contrasts with the typical midbrain lesion association for peduncular hallucinations.
Implications:
- The thalamus, specifically the posterior region, may play a role in the generation of peduncular hallucinations.
- This case expands the known etiological spectrum for peduncular hallucinosis, highlighting the thalamus as a potential site of pathology.
- Neuroimaging findings in thalamic lesions should be considered in the differential diagnosis of peduncular hallucinosis.