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A volumetric magnetic resonance imaging study of the amygdala in frontotemporal lobar degeneration and Alzheimer's disease

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Version 2 2024-06-03, 18:16
Version 1 2019-07-18, 12:44
journal contribution
posted on 2024-06-03, 18:16 authored by JL Whitwell, EL Sampson, HC Watt, Richard HarveyRichard Harvey, MN Rossor, NC Fox
The amygdala is severely atrophied at post-mortem in frontotemporal lobar degeneration (FTLD), and may contribute to the prominent behavioural changes that are early features of FTLD. The aim of this study was to assess amygdala atrophy using MRI in the main syndromic variants of FTLD and Alzheimer's disease (AD). Brain and amygdala volumes, adjusted for intracranial volume, were measured on 46 clinically diagnosed FTLD patients [22 frontal variant FTD (FTD), 14 semantic dementia (SD), 10 progressive non-fluent aphasia (PNFA)], 20 AD patients, and 17 controls. While severe amygdala atrophy was present in both FTLD (41% smallerthan controls on the left; 33% on the right) and in AD (22% on the left; 19% on the right), the FTLD group had significantly greater amygdala atrophy (z = 3.21, p = 0.001 left, z = 2.50, p = 0.01 right) and left/right asymmetry (z = 2.03, p = 0.04) than AD. Amygdala atrophy was greater in SD than FTD, PNFA and AD (p < 0.02 for all). Highly asymmetrical atrophy was present in SD, greater on the left (z = 3.23, p = 0.001), and to a lesser extent in PNFA. Despite an overlap between clinical and radiological features of FTLD and AD, marked amygdala atrophy points towards a diagnosis of FTLD, with left greater than right atrophy suggestive of one of the language variants.

History

Journal

Dementia and geriatric cognitive disorders

Volume

20

Pagination

238-244

Location

Basel, Switzerland

ISSN

1420-8008

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2005, S. Karger AG, Basel

Issue

4

Publisher

Karger

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