Hippocampal Subfield Volumetry: Differential Pattern of Atrophy in Different Forms of Genetic Frontotemporal Dementia

Martina Bocchetta, Juan Eugenio Iglesias, Marzia A. Scelsi, David M. Cash, M. Jorge Cardoso, Marc Modat, Andre Altmann, Sebastien Ourselin, Jason D. Warren, Jonathan D. Rohrer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Background: Frontotemporal dementia (FTD) is a heterogeneous neurodegenerative disorder, with a strong genetic component. Previous research has shown that medial temporal lobe atrophy is a common feature of FTD. However, no study has so far investigated the differential vulnerability of the hippocampal subfields in FTD. Objectives: We aimed to investigate hippocampal subfield volumes in genetic FTD. Methods: We in6/2/2018vestigated hippocampal subfield volumes in a cohort of 75 patients with genetic FTD (age: mean (standard deviation) 59.3 (7.7) years; disease duration: 5.1 (3.4) years; 29 with MAPT, 28 with C9orf72, and 18 with GRN mutations) compared with 97 age-matched controls (age: 62.1 (11.1) years). We performed a segmentation of their volumetric T1-weighted MRI scans to extract hippocampal subfields volumes. Left and right volumes were summed and corrected for total intracranial volumes. Results: All three groups had smaller hippocampi than controls. The MAPT group had the most atrophic hippocampi, with the subfields showing the largest difference from controls being CA1-4 (24-27%, p < 0.0005). For C9orf72, the CA4, CA1, and dentate gyrus regions (8-11%, p < 0.0005), and for GRN the presubiculum and subiculum (10-14%, p < 0.0005) showed the largest differences from controls. Conclusions: The hippocampus was affected in all mutation types but a different pattern of subfield involvement was found in the three genetic groups, consistent with differential cortical-subcortical network vulnerability.

Original languageEnglish
Pages (from-to)497-504
Number of pages8
JournalJournal of Alzheimer's Disease
Volume64
Issue number2
DOIs
Publication statusPublished - 19 Jun 2018

Keywords

  • Genetic frontotemporal dementia
  • hippocampal subfields
  • magnetic resonance imaging
  • volumetry

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