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Longitudinal gray matter contraction in three variants of primary progressive aphasia: A tenser-based morphometry study.

Abstract：

:The present study investigated the pattern of longitudinal changes in cognition and anatomy in three variants of primary progressive aphasia (PPA). Eight patients with the non-fluent variant of PPA (nfvPPA), 13 patients with the semantic variant (svPPA), seven patients with the logopenic variant (lvPPA), and 29 age-matched, neurologically healthy controls were included in the study. All participants underwent longitudinal MRI, neuropsychological and language testing at baseline and at a 1-year follow-up. Tenser-based morphometry (TBM) was applied to T1-weighted MRI images in order to map the progression of gray and white matter atrophy over a 1-year period. Results showed that each patient group was characterized by a specific pattern of cognitive and anatomical changes. Specifically, nfvPPA patients showed gray matter atrophy progression in the left frontal and subcortical areas as well as a decline in motor speech and executive functions; svPPA patients presented atrophy progression in the medial and lateral temporal lobe and decline in semantic memory abilities; and lvPPA patients showed atrophy progression in lateral/posterior temporal and medial parietal regions with a decline in memory, sentence repetition and calculations. In addition, in all three variants, the white matter fibers underlying the abovementioned cortical areas underwent significant volume contraction over a 1-year period. Overall, these results indicate that the three PPA variants present distinct patterns of neuroanatomical contraction, which reflect their clinical and cognitive progression.

journal_name

Neuroimage Clin

journal_title

NeuroImage. Clinical

authors

Brambati SM,Amici S,Racine CA,Neuhaus J,Miller Z,Ogar J,Dronkers N,Miller BL,Rosen H,Gorno-Tempini ML

doi

10.1016/j.nicl.2015.01.011

subject

Has Abstract

pub_date

2015-01-22 00:00:00

pages

345-55

issn

2213-1582

pii

S2213-1582(15)00012-1

journal_volume

8

pub_type

杂志文章

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