scholarly journals Infratentorial pathology in frontotemporal dementia: cerebellar grey and white matter alterations in FTD phenotypes

2021 ◽  
Author(s):  
Mary Clare McKenna ◽  
Rangariroyashe H. Chipika ◽  
Stacey Li Hi Shing ◽  
Foteini Christidi ◽  
Jasmin Lope ◽  
...  
Keyword(s):  
White Matter ◽  
Fractional Anisotropy ◽  
Cortical Thickness ◽  
Cerebellar Atrophy ◽  
Primary Progressive Aphasia ◽  
Radial Diffusivity ◽  
Axial Diffusivity ◽  
Progressive Aphasia ◽  
Primary Progressive ◽  
Crus I

AbstractThe contribution of cerebellar pathology to cognitive and behavioural manifestations is increasingly recognised, but the cerebellar profiles of FTD phenotypes are relatively poorly characterised. A prospective, single-centre imaging study has been undertaken with a high-resolution structural and diffusion tensor protocol to systematically evaluate cerebellar grey and white matter alterations in behavioural-variant FTD(bvFTD), non-fluent variant primary progressive aphasia(nfvPPA), semantic-variant primary progressive aphasia(svPPA), C9orf72-positive ALS-FTD(C9 + ALSFTD) and C9orf72-negative ALS-FTD(C9-ALSFTD). Cerebellar cortical thickness and complementary morphometric analyses were carried out to appraise atrophy patterns controlling for demographic variables. White matter integrity was assessed in a study-specific white matter skeleton, evaluating three diffusivity metrics: fractional anisotropy (FA), axial diffusivity (AD) and radial diffusivity (RD). Significant cortical thickness reductions were identified in: lobule VII and crus I in bvFTD; lobule VI VII, crus I and II in nfvPPA; and lobule VII, crus I and II in svPPA; lobule IV, VI, VII and Crus I and II in C9 + ALSFTD. Morphometry revealed volume reductions in lobule V in all groups; in addition to lobule VIII in C9 + ALSFTD; lobule VI, VIII and vermis in C9-ALSFTD; lobule V, VII and vermis in bvFTD; and lobule V, VI, VIII and vermis in nfvPPA. Widespread white matter alterations were demonstrated by significant fractional anisotropy, axial diffusivity and radial diffusivity changes in each FTD phenotype that were more focal in those with C9 + ALSFTD and svPPA. Our findings indicate that FTD subtypes are associated with phenotype-specific cerebellar signatures with the selective involvement of specific lobules instead of global cerebellar atrophy.

scholarly journals White Matter Disruption and Connected Speech in Non-Fluent and Semantic Variants of Primary Progressive Aphasia

2017 ◽  
Vol 7 (1) ◽  
pp. 52-73 ◽  
Author(s):  
Karine Marcotte ◽  
Naida L. Graham ◽  
Kathleen C. Fraser ◽  
Jed A. Meltzer ◽  
David F. Tang-Wai ◽  
...  
Keyword(s):  
White Matter ◽  
Diffusion Tensor ◽  
Primary Progressive Aphasia ◽  
Healthy Controls ◽  
Radial Diffusivity ◽  
Connected Speech ◽  
Single Measure ◽  
Progressive Aphasia ◽  
Primary Progressive ◽  
Inferior Longitudinal Fasciculus

Differential patterns of white matter disruption have recently been reported in the non-fluent (nfvPPA) and semantic (svPPA) variants of primary progressive aphasia (PPA). No single measure is sufficient to distinguish between the PPA variants, but connected speech allows for the quantification of multiple measures. The aim of the present study was to further investigate the white matter correlates associated with connected speech features in PPA. We examined the relationship between white matter metrics and connected speech deficits using an automated analysis of transcriptions of connected speech and diffusion tensor imaging in language-related tracts. Syntactic, lexical, and semantic features were automatically extracted from transcriptions of topic-directed interviews conducted with groups of individuals with nfvPPA or svPPA as well as with a group of healthy controls. A principal component analysis was performed in order to reduce the number of language measures and yielded a five-factor solution. The results indicated that nfvPPA patients differed from healthy controls on a syntactic factor, and svPPA patients differed from controls on two semantic factors. However, the patient groups did not differ on any factor. Moreover, a correlational analysis revealed that the lexical richness factor was significantly correlated with radial diffusivity in the left inferior longitudinal fasciculus, which suggests that semantic deficits in connected speech reflect a disruption of this ventral pathway, and which is largely consistent with the results of previous studies. Using an automated approach for the analysis of connected speech combined with probabilistic tractography, the present findings demonstrate that nfvPPA patients are impaired relative to healthy controls on syntactic measures and have increased radial diffusivity in the left superior longitudinal fasciculus, whereas the svPPA group was impaired on lexico-semantic measures relative to controls and showed increased radial diffusivity in the uncinate and inferior longitudinal fasciculus bilaterally.

scholarly journals A Correlational Study between Microstructural White Matter Properties and Macrostructural Gray Matter Volume Across Normal Ageing: Conjoint DTI and VBM Analysis

2018 ◽  
Vol 11 ◽  
pp. 1178623X1879992 ◽  
Author(s):  
Vikas Pareek ◽  
VP Subramanyam Rallabandi ◽  
Prasun K Roy
Keyword(s):  
White Matter ◽  
Life Span ◽  
Fractional Anisotropy ◽  
Gray Matter ◽  
Healthy Aging ◽  
Gray Matter Volume ◽  
Mean Diffusivity ◽  
Radial Diffusivity ◽  
Axial Diffusivity ◽  
Matter Volume

We investigate the relationship between Gray matter’s volume vis-a-vis White matter’s integrity indices, such Axial diffusivity, Radial diffusivity, Mean diffusivity, and Fractional anisotropy, in individuals undergoing healthy aging. We investigated MRI scans of 177 adults across 20 to 85 years. We used Voxel-based morphometry, and FDT-FSL analysis for estimation of Gray matter volume and White matter’s diffusion indices respectively. Across the life span, we observed an inter-relationship between the Gray matter and White matter, namely that both Axial diffusivity and Mean Diffusivity show strong correlation with Gray matter volume, along the aging process. Furthermore, across all ages the Fractional anisotropy and Mean diffusivity are found to be significantly reduced in females when compared to males, but there are no significant gender differences in Axial Diffusivity and Radial diffusivity. We conclude that for both genders across all ages, the Gray matter’s Volume is strongly correlated with White matter’s Axial Diffusivity and Mean Diffusivity, while being weakly correlated with Fractional Anisotropy. Our study clarifies the multi-scale relationship in brain tissue, by elucidating how the White matter’s micro-structural parameters influences the Gray matter’s macro-structural characteristics, during healthy aging across the life-span.

PROMINENT MICROGLIAL ACTIVATION IN CORTICAL WHITE MATTER IS SELECTIVELY ASSOCIATED WITH CORTICAL ATROPHY IN PRIMARY PROGRESSIVE APHASIA

2017 ◽  
Vol 13 (7) ◽  
pp. P1499
Author(s):  
Daniel T. Ohm ◽  
Garam Kim ◽  
Tamar Gefen ◽  
Alfred Rademaker ◽  
Sandra Weintraub ◽  
...  
Keyword(s):  
White Matter ◽  
Microglial Activation ◽  
Primary Progressive Aphasia ◽  
Cortical Atrophy ◽  
Progressive Aphasia ◽  
Primary Progressive

scholarly journals Differentiation between Subtypes of Primary Progressive Aphasia by Using Cortical Thickness and Diffusion-Tensor MR Imaging Measures

Radiology ◽  
2015 ◽  
Vol 276 (1) ◽  
pp. 219-227 ◽  
Author(s):  
Federica Agosta ◽  
Pilar M. Ferraro ◽  
Elisa Canu ◽  
Massimiliano Copetti ◽  
Sebastiano Galantucci ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Cortical Thickness ◽  
Diffusion Tensor ◽  
Primary Progressive Aphasia ◽  
Progressive Aphasia ◽  
Primary Progressive ◽  
And Diffusion ◽  
Diffusion Tensor Mr Imaging

scholarly journals Whole-brain white matter disruption in semantic and nonfluent variants of primary progressive aphasia

2011 ◽  
Vol 34 (4) ◽  
pp. 973-984 ◽  
Author(s):  
Graeme C. Schwindt ◽  
Naida L. Graham ◽  
Elizabeth Rochon ◽  
David F. Tang-Wai ◽  
Nancy J. Lobaugh ◽  
...  
Keyword(s):  
White Matter ◽  
Primary Progressive Aphasia ◽  
Whole Brain ◽  
Progressive Aphasia ◽  
Primary Progressive ◽  
Brain White Matter

scholarly journals White Matter Hyperintensities Contribute to Language Deficits in Primary Progressive Aphasia

2020 ◽  
Vol 33 (3) ◽  
pp. 179-191
Author(s):  
Erin L. Meier ◽  
Bonnie L. Breining ◽  
Shannon M. Sheppard ◽  
Emily B. Goldberg ◽  
Donna C. Tippett ◽  
...  
Keyword(s):  
White Matter ◽  
White Matter Hyperintensities ◽  
Primary Progressive Aphasia ◽  
Language Deficits ◽  
Progressive Aphasia ◽  
Primary Progressive

scholarly journals Emotion detection deficits and changes in personality traits linked to loss of white matter integrity in primary progressive aphasia

2017 ◽  
Vol 16 ◽  
pp. 447-454 ◽  
Author(s):  
Namita Multani ◽  
Sebastiano Galantucci ◽  
Stephen M. Wilson ◽  
Tal Shany-Ur ◽  
Pardis Poorzand ◽  
...  
Keyword(s):  
White Matter ◽  
Personality Traits ◽  
Primary Progressive Aphasia ◽  
White Matter Integrity ◽  
Emotion Detection ◽  
Progressive Aphasia ◽  
Primary Progressive

scholarly journals Neural substrates of verbal repetition deficits in primary progressive aphasia

2021 ◽  
Author(s):  
Hilary E Miller ◽  
Claire Cordella ◽  
Jessica A Collins ◽  
Rania Ezzo ◽  
Megan Quimby ◽  
...  
Keyword(s):  
Working Memory ◽  
Cortical Thickness ◽  
Digit Span ◽  
Primary Progressive Aphasia ◽  
Supramarginal Gyrus ◽  
Phonological Working Memory ◽  
Progressive Aphasia ◽  
Primary Progressive ◽  
Left Posterior ◽  
Verbal Repetition

Abstract In this cross-sectional study, we examined the relationship between cortical thickness and performance on several verbal repetition tasks in a cohort of patients with primary progressive aphasia in order to test predictions generated by theoretical accounts of phonological working memory that predict phonological content buffers in left posterior inferior frontal sulcus and supramarginal gyrus. Cortical surfaces were reconstructed from magnetic resonance imaging scans from 42 participants diagnosed with primary progressive aphasia. Cortical thickness was measured in a set of anatomical regions spanning the entire cerebral cortex. Correlation analyses were performed between cortical thickness and average score across three phonological working memory related tasks: the Repetition subtest from the Western Aphasia Battery, a forward digit span task, and a backward digit span task. Significant correlations were found between average working memory score across tasks and cortical thickness in left supramarginal gyrus and left posterior inferior frontal sulcus, in support of prior theoretical accounts of phonological working memory. Exploratory whole-brain correlation analyses performed for each of the three behavioral tasks individually revealed a distinct set of positively-correlated regions for each task. Comparison of cortical thickness measures from different primary progressive aphasia subtypes to cortical thickness in age-matched controls further revealed unique patterns of atrophy in the different subtypes.

scholarly journals Greater Loss of White Matter Integrity in Postural Instability and Gait Difficulty Subtype of Parkinson's Disease

2014 ◽  
Vol 41 (6) ◽  
pp. 763-768 ◽  
Author(s):  
Quanquan Gu ◽  
Peiyu Huang ◽  
Min Xuan ◽  
Xiaojun Xu ◽  
Dan Li ◽  
...  
Keyword(s):  
White Matter ◽  
Fractional Anisotropy ◽  
Diffusion Tensor ◽  
Critical Role ◽  
Postural Instability ◽  
White Matter Integrity ◽  
Radial Diffusivity ◽  
Superior Longitudinal Fasciculus ◽  
Axial Diffusivity ◽  
White Matter Abnormalities

ABSTRACTBackground: Patients with the postural instability and gait difficulty (PIGD) subtype of Parkinson disease (PD) are at a higher risk of dysfunction and are less responsive to dopamine replacement therapy. The PIGD subtype was found to largely associate with white matter lesions, but details of the diffusion changes within these lesions have not been fully investigated. Voxel-based analysis for diffusion tensor imaging data is one of the preferred measures to compare diffusion changes in each voxel in any part of the brain. Methods: PD patients with the PIGD (n=12) and non-PIGD subtypes (n=12) were recruited to compare diffusion differences in fractional anisotropy, axial diffusivity, and radial diffusivity with voxel-based analysis. Results: Significantly reduced fractional anisotropy in bilateral superior longitudinal fasciculus, bilateral anterior corona radiata, and the left genu of the corpus callosum were shown in the PIGD subtype compared with the non-PIGD subtype. Increased radial diffusivity in the left superior longitudinal fasciculus was found in the PIGD subtype with no statistical differences in axial diffusivity found. Conclusions: Our study confirms previous findings that white matter abnormalities were greater in the PIGD subtype than in the non-PIGD subtype. Additionally, our findings suggested: (1) compared with the non-PIGD subtype, loss of white matter integrity was greater in the PIGD subtype; (2) bilateral superior longitudinal fasciculus may play a critical role in microstructural white matter abnormalities in the PIGD subtype; and (3) reduced white matter integrity in the PIGD subtype could be mainly attributed to demyelination rather than axonal loss.

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