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BACKGROUND AND PURPOSE: The relationship between lesion formation and brain atrophy development in the early phase of multiple sclerosis is unclear. We investigated the association between new lesion accumulation and brain atrophy progression in patients with clinically isolated syndrome over 48 months. MATERIALS AND METHODS: Patients with clinically isolated syndrome ( n = 210) were evaluated with 1.5T MR imaging at baseline and at 6, 12, 24, 36, and 48 months as part of a multicenter observational study of early administration of intramuscular interferon β-1a. Mixed-effect model analyses, adjusted for age, sex, and treatment status, investigated the association between accumulation of contrast-enhancing and T2 lesions and brain-volume percent changes in a 48-month period. RESULTS: In patients with clinically isolated syndrome, the average whole-brain volume decreased 2.5%, the mean lateral ventricle volume increased 16.9%, and a mean of 7.7 new/enlarging T2 lesions accumulated over the follow-up period. Patients with clinically isolated syndrome who showed greater percentages of change in whole-brain, white and gray matter, cortical, and lateral ventricle volumes over the follow-up period had more severe lesion outcomes at baseline (all P < .007). There were significant associations between decreased individual brain-volume measures at baseline and greater percentages of change during follow-up ( P < .05). We found a significant association between the total cumulative number of new/enlarging T2 lesions and the evolution of whole-brain ( P < .001), lateral ventricle ( P = .007), gray matter and thalamic ( P = .013), subcortical deep gray matter ( P = .015), and cortical ( P = .036) volumes over the follow-up period. CONCLUSIONS: Lesion accumulation and brain-volume changes occur simultaneously in the early phase of clinically isolated syndrome. More severe lesion and brain-volume outcomes at baseline were associated with greater development of brain atrophy over the follow-up period in patients with clinically isolated syndrome. ABBREVIATIONS: CIS clinically isolated syndrome CE contrast-enhancing EDSS Expanded Disability Status Scale LV lesion volume SDGM subcortical deep gray matter
American Journal of Neuroradiology – American Journal of Neuroradiology
Published: Aug 1, 2015
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