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Publication Detail
White matter tract signatures of the progressive aphasias.
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Mahoney CJ, Malone IB, Ridgway GR, Buckley AH, Downey LE, Golden HL, Ryan NS, Ourselin S, Schott JM, Rossor MN, Fox NC, Warren JD
  • Publication date:
    06/2013
  • Pagination:
    1687, 1699
  • Journal:
    Neurobiol Aging
  • Volume:
    34
  • Issue:
    6
  • Status:
    Published
  • Country:
    United States
  • PII:
    S0197-4580(12)00615-X
  • Language:
    eng
  • Keywords:
    Aged, Aphasia, Primary Progressive, Cohort Studies, Cross-Sectional Studies, Diffusion Tensor Imaging, Disease Progression, Female, Humans, Male, Middle Aged, Nerve Fibers, Myelinated
Abstract
The primary progressive aphasias (PPA) are a heterogeneous group of language-led neurodegenerative diseases resulting from large-scale brain network degeneration. White matter (WM) pathways bind networks together, and might therefore hold information about PPA pathogenesis. Here we used diffusion tensor imaging and tract-based spatial statistics to compare WM tract changes between PPA syndromes and with respect to Alzheimer's disease and healthy controls in 33 patients with PPA (13 nonfluent/agrammatic PPA); 10 logopenic variant PPA; and 10 semantic variant PPA. Nonfluent/agrammatic PPA was associated with predominantly left-sided and anterior tract alterations including uncinate fasciculus (UF) and subcortical projections; semantic variant PPA with bilateral alterations in inferior longitudinal fasciculus and UF; and logopenic variant PPA with bilateral but predominantly left-sided alterations in inferior longitudinal fasciculus, UF, superior longitudinal fasciculus, and subcortical projections. Tract alterations were more extensive than gray matter alterations, and the extent of alteration across tracts and PPA syndromes varied between diffusivity metrics. These WM signatures of PPA syndromes illustrate the selective vulnerability of brain language networks in these diseases and might have some pathologic specificity.
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Neurodegenerative Diseases
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Neurodegenerative Diseases
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Dept of Med Phys & Biomedical Eng
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Neurodegenerative Diseases
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Neurodegenerative Diseases
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