The purpose of this study is to develop tools to detect, measure, monitor and predict axonal damage in the course of CIS and during Multiple sclerosis (MS), in order to be able to consider as early as possible an adaptation of the background treatment in patients with MS. patients with radiological criteria of poor long-term clinical course.
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severity of the disease defined by Expanded Disability Status Scale (EDSS) ≥ 2.0
Timeframe: At 5 years