[Dementia and Lewy bodies].

Area of Science:

• Neurology
• Neuroscience
• Pathology

Background:

• Established consensus criteria for dementia with Lewy bodies (DLB) from 1996 have guided research.
• DLB is a clinicopathologically defined entity sharing features with Alzheimer's disease (AD) and Parkinson's disease (PD).
• Current DLB criteria differentiate it from PD dementia based on the earlier onset of motor symptoms in PD dementia.

Purpose of the Study:

• To evaluate the effectiveness of standardized clinical diagnostic criteria for DLB.
• To investigate the impact of concomitant Alzheimer's disease (AD) pathology on DLB clinical presentation.
• To explore the relationship and potential overlap between DLB and Parkinson's disease (PD) dementia.

Main Methods:

• Review of studies evaluating standardized clinical diagnostic criteria for DLB.
• Analysis of cases with Lewy body pathology and co-existing AD pathological features.
• Examination of emerging data on the interplay between AD and Lewy body pathologies.

Main Results:

• Standardized DLB criteria have shown high predictability for Lewy body pathology.
• A significant number of cases with Lewy body pathology and AD pathology are not clinically detected.
• Emerging data indicates AD pathology may mask the clinical expression of Lewy body pathology.

Conclusions:

• While current DLB criteria are valuable, they may not capture all cases, particularly those with co-existing AD pathology.
• Alzheimer's disease pathology can obscure the clinical diagnosis of dementia with Lewy bodies.
• Dementia with Lewy bodies and Parkinson's disease dementia might represent a more unified spectrum of disease than previously distinguished.