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Abstract #2058

What explains gray matter atrophy in long-standing multiple sclerosis?

Martijn D. Steenwijk 1 , Marita Daams 1,2 , Petra Pouwels 3 , Lisanne J. Balk 4 , Prejaas K. Tewarie 4 , Joep Killestein 4 , Bernard M.J. Uitdehaag 4 , Jeroen J.G. Geurts 2 , Frederik Barkhof 1 , and Hugo Vrenken 1,3

1 Department of Radiology and Nuclear Medicine, VU University medical center, Amsterdam, Noord-Holland, Netherlands, 2 Department of Anatomy and Neurosciences, VU University medical center, Amsterdam, Noord-Holland, Netherlands, 3 Department of Physics and Medical Technology, VU University medical center, Amsterdam, Noord-Holland, Netherlands, 4 Department of Neurology, VU University medical center, Amsterdam, Noord-Holland, Netherlands

Gray matter (GM) atrophy is common in multiple sclerosis (MS), but the relation with white matter (WM) pathology is largely unknown. We aimed to identify the WM measures that explain whole brain GM, cortical and subcortical atrophy in a large cohort (n=208) of long-standing MS patients using stepwise linear regression. WM atrophy and lesion volume were the most important measures explaining whole brain and subcortical atrophy, while cortical atrophy was associated with NAWM integrity loss. The weaker relationship between GM atrophy and WM pathology in progressive patients might indicate a more independent neurodegenerative disease process in these patients.

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