Lesion evolution and neurodegeneration in RVCL-S: A monogenic microvasculopathy
Andria L Ford, Victoria W Chin, Slim Fellah, Michael M Binkley, Allie M Bodin, Vamshi Balasetti, Yewande Taiwo, Peter Kang, Doris Lin, Joanna C Jen, M Gilbert Grand, Madonna Bogacki, M Kathryn Liszewski, Dennis Hourcade, Yasheng Chen, Jason Hassenstab, Jin-Moo Lee, Hongyu An, Jonathan J Miner, John P Atkinson, Andria L Ford, Victoria W Chin, Slim Fellah, Michael M Binkley, Allie M Bodin, Vamshi Balasetti, Yewande Taiwo, Peter Kang, Doris Lin, Joanna C Jen, M Gilbert Grand, Madonna Bogacki, M Kathryn Liszewski, Dennis Hourcade, Yasheng Chen, Jason Hassenstab, Jin-Moo Lee, Hongyu An, Jonathan J Miner, John P Atkinson
Abstract
Objective: To characterize lesion evolution and neurodegeneration in retinal vasculopathy with cerebral leukoencephalopathy and systemic manifestations (RVCL-S) using multimodal MRI.
Methods: We prospectively performed MRI and cognitive testing in RVCL-S and healthy control cohorts. Gray and white matter volume and disruption of white matter microstructure were quantified. Asymmetric spin echo acquisition permitted voxel-wise oxygen extraction fraction (OEF) calculation as an in vivo marker of microvascular ischemia. The RVCL-S cohort was included in a longitudinal analysis of lesion subtypes in which hyperintense lesions on fluid-attenuated inversion recovery (FLAIR), T1-postgadolinium, and diffusion-weighted imaging were delineated and quantified volumetrically.
Results: Twenty individuals with RVCL-S and 26 controls were enrolled. White matter volume and microstructure declined faster in those with RVCL-S compared to controls. White matter atrophy in RVCL-S was highly linear (ρ = -0.908, p < 0.0001). Normalized OEF was elevated in RVCL-S and increased with disease duration. Multiple cognitive domains, specifically those measuring working memory and processing speed, were impaired in RVCL-S. Lesion volumes, regardless of subtype, progressed/regressed with high variability as a function of age, while FLAIR lesion burden increased near time to death (p < 0.001).
Conclusion: RVCL-S is a monogenic microvasculopathy affecting predominantly the white matter with regard to atrophy and cognitive impairment. White matter volumes in RVCL-S declined linearly, providing a potential metric against which to test the efficacy of future therapies. Progressive elevation of white matter OEF suggests that microvascular ischemia may underlie neurodegeneration in RVCL-S.
Copyright © 2020 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.
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