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Structural brain abnormalities in patients with Parkinson's disease with visual hallucinations: a comparative
Romulo Lopes Gama1, Veralice Meireles Sales Bruin1, Daniel Gurgel Fernandes Távora1
1Pós Graduação Ciências Médicas, Universidade Federal do Ceara, Fortaleza, Brazil.
Brain and Cognition
|April 16, 2014
Summary
Parkinson's disease patients with visual hallucinations exhibit distinct frontal lobe grey matter reductions. These changes, particularly in the left operculum, correlate with cognitive dysfunction and visual processing abnormalities.
Area of Science:
- Neuroscience
- Neurology
- Medical Imaging
Background:
- Parkinson's disease (PD) is a neurodegenerative disorder.
- Visual hallucinations (VHs) are a common and distressing non-motor symptom in PD.
- Understanding the neurobiological underpinnings of VHs in PD is crucial for patient care.
Purpose of the Study:
- To investigate the clinical features and cerebral structural changes in Parkinson's disease patients experiencing diurnal visual hallucinations.
- To identify specific brain regions associated with VHs and cognitive dysfunction in PD.
Main Methods:
- Utilized magnetic resonance imaging (MRI) and voxel-based morphometry (VBM) to analyze brain structure.
- Compared grey matter volume in PD patients with and without VHs, and further stratified by cognitive status.
- Assessed clinical characteristics using the Unified Parkinson's Disease Rating Scale (UPDRS).
Main Results:
- Patients with VHs showed worse performance on UPDRS I (mentation) and UPDRS III (motor) scores.
- Significant reductions in grey matter volume were observed in the left opercula frontal gyrus and left superior frontal gyrus in PD patients with VHs compared to controls.
- Cognitive dysfunction in PD patients with VHs was associated with reduced grey matter in the left opercular frontal gyrus, while those without cognitive dysfunction showed reductions in the left insula and left trigonal frontal gyrus.
Conclusions:
- Abnormalities in the frontal cortex, including the left insula, frontal operculum, trigonal frontal gyrus, and orbital frontal regions, may predispose PD patients to VHs.
- Compromise of the left operculum specifically distinguishes PD patients with VHs and cognitive dysfunction.
- Findings support a top-down visual processing model for the development of VHs in Parkinson's disease.
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