Automated Hippocampal Subfield Volumetric Analyses in Atypical Alzheimer's Disease

Musa Gabere, Nha Trang Thu Pham, Jonathan Graff-Radford, Mary M. MacHulda, Joseph R. Duffy, Keith A. Josephs, Jennifer L. Whitwell

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Posterior cortical atrophy (PCA) and logopenic progressive aphasia (LPA) are two of the most common variants of atypical Alzheimer's disease (AD). Both PCA and LPA are associated with relative sparing of hippocampus compared to neocortex, although hippocampal atrophy is observed. It is unclear whether regional patterns of hippocampal subfield involvement differ between PCA and LPA, and whether they differ from typical AD. Objective: To assess volume of specific subfields of the hippocampus in PCA, LPA, and typical AD. Methods: Fifty-nine patients with PCA and 77 patients with LPA were recruited and underwent T1-weighted MRI and Pittsburgh Compound B (PiB) PET at Mayo Clinic. Thirty-six probable AD patients and 100 controls were identified from the Alzheimer's Disease Neuroimaging Initiative. Hippocampal subfield volumes were calculated using Freesurfer, and volumes were compared between PCA, LPA, AD, and controls using Kruskal-Wallis and Dunn tests. Results: The LPA and PCA groups both showed the most striking abnormalities in CA4, presubiculum, molecular layer of the hippocampus, molecular and granule cell layers of the dentate gyrus, and the hippocampal-amygdala transition area, although atrophy was left-sided in LPA. PCA showed smaller volume of right presubiculum compared to LPA, with trends for smaller volumes of right parasubiculum and fimbria. LPA showed a trend for smaller volumes of left CA1 compared to PCA. The AD group showed smaller volumes of the right subiculum, CA1, and presubiculum compared to LPA. Conclusion: Patterns of hippocampal subfield atrophy differ across the different syndromic variants of AD.

Original languageEnglish (US)
Pages (from-to)927-937
Number of pages11
JournalJournal of Alzheimer's Disease
Volume78
Issue number3
DOIs
StatePublished - 2020

Keywords

  • Alzheimer's disease
  • hippocampal subfields
  • hippocampus
  • logopenic progressive aphasia
  • magnetic resonance imaging
  • posterior cortical atrophy

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

Fingerprint

Dive into the research topics of 'Automated Hippocampal Subfield Volumetric Analyses in Atypical Alzheimer's Disease'. Together they form a unique fingerprint.

Cite this