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Using Retinal Imaging to Study Dementia

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Overdiagnosing Vascular Dementia using Structural Brain Imaging for Dementia Work-Up.

Ellis Niemantsverdriet¹, Bart F E Feyen², Nathalie Le Bastard³

¹Reference Center for Biological Markers of Dementia (BIODEM), Laboratory of Neurochemistry and Behavior, and Biobank, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium.

Journal of Alzheimer'S Disease : JAD

|January 31, 2015

Summary

Structural brain imaging showing non-significant lesions often leads to misdiagnosis of vascular dementia. Autopsy confirmation revealed fewer cases than clinical diagnosis, highlighting imaging

Keywords:

Alzheimer's disease brain imaging dementia differential dementia diagnosis magnetic resonance imaging vascular dementia

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Area of Science:

Neurology
Pathology
Gerontology

Background:

Dementia diagnosis relies heavily on clinical assessment and neuroimaging.
Vascular dementia (VaD) is often overdiagnosed when cerebrovascular lesions are present but not definitively linked to cognitive decline.
Autopsy confirmation remains the gold standard for determining dementia etiology.

Purpose of the Study:

To investigate the hypothesis that non-significant cerebrovascular lesions on structural brain imaging contribute to the overdiagnosis of vascular dementia.
To compare clinical diagnoses of dementia with autopsy-confirmed diagnoses in a cohort of patients.

Main Methods:

Retrospective analysis of 71 patients with autopsy-confirmed dementia diagnoses.
Review of structural brain imaging for cerebrovascular lesions.
Comparison of clinical diagnoses (possible/probable VaD) with autopsy findings.

Main Results:

59% of patients had Alzheimer's disease (AD), and 41% had non-AD dementia forms.
Clinical diagnosis identified 38% of patients with possible or probable VaD.
Autopsy confirmed VaD in only 19% of patients (p = 0.017).
Patients with vascular lesions on imaging were frequently misdiagnosed with VaD.

Conclusions:

Non-significant cerebrovascular lesions on brain imaging can lead to overdiagnosis of vascular dementia.
Clinical diagnosis of VaD is often inaccurate compared to autopsy confirmation.
Rethinking diagnostic criteria for VaD based on imaging findings is warranted.