Different patterns of gray matter atrophy in behavioral variant frontotemporal dementia with and without episodic memory impairment

Elisa de Paula França Resende, Michael Hornberger, Henrique Cerqueira Guimarães, Leandro Boson Gambogi, Luciano Inácio Mariano, Antônio Lúcio Teixeira, Paulo Caramelli, Leonardo Cruz de Souza

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Abstract

Background: Differentiating patients with behavioral variant frontotemporal dementia (bvFTD) from Alzheimer's disease (AD) is important as these two conditions have distinct treatment and prognosis. Using episodic impairment and medial temporal lobe atrophy as a tool to make this distinction has been debatable in the recent literature, as some patients with bvFTD can also have episodic memory impairment and medial temporal lobe atrophy early in the disease. 

Objectives: To compare brain atrophy patterns of patients with bvFTD with and without episodic memory impairment to that of patients with AD. Methods: We analyzed 19 patients with bvFTD, 21 with AD and 21 controls, matched by age, sex, and years of education. They underwent brain MRI and the memory test from the Brief Cognitive Battery (BCB) to assess episodic memory. We then categorized the bvFTD group into amnestic (BCB delayed recall score <7) and non-amnestic. 

Results: The amnestic bvFTD group (n = 8) had significant gray matter atrophy in the left parahippocampal gyrus, right cingulate and precuneus regions compared with the nonamnestic group. Compared with AD, amnestic bvFTD had more atrophy in the left fusiform cortex, left insula, left inferior temporal gyrus and right temporal pole, whereas patients with AD had more atrophy in the left hippocampus, left frontal pole and left angular gyrus. 

Conclusions: There is a group of amnestic bvFTD patients with episodic memory dysfunction and significant atrophy in medial temporal structures, which poses a challenge in considering only these features when differentiating bvFTD from AD clinically.

Original languageEnglish
Pages (from-to)1848-1857
Number of pages10
JournalInternational Journal of Geriatric Psychiatry
Volume36
Issue number12
Early online date1 Feb 2021
DOIs
Publication statusE-pub ahead of print - 1 Feb 2021

Keywords

  • Alzheimer's disease
  • episodic memory
  • frontotemporal dementia
  • gray matter
  • neuroimaging

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