MRI Biomarkers Predictive of Disability Progression in Patients With Multiple Sclerosis

Inclusion Criteria: * Age ≥ 18 years, * Duration of disease ≤ 25 years, * Irreversible disability ≤ 7 (permanent wheelchair use) on the EDSS scale Exclusion Criteria: * Other progressive neurological disease, * Isolated radiologic syndrome (RIS), * Severe psychiatric pathology not in balance, * Change in dosage, discontinuation or initiation of a psychotropic treatment within the last month, * Change in background MS treatment for less than 3 months, * A course of corticosteroids (oral or intravenous) for less than one month, * Patient with a contraindication to MRI: pregnancy, metallic ocular foreign body (accidental splinters or others), pacemaker, implantable defibrillator, neurostimulator not compatible with MRI 7.0 T, cochlear implants and in general any electronic medical equipment implanted in an irremovable way: metallic cardiac valve, vascular clips (formerly implanted on cranial aneurysm), metallic prosthesis...), * Illiterate and non-French speaking patient: patient who is partially or completely unable to read and write French. * Patient benefiting from reinforced protection, i.e. minor, subject deprived of liberty by a judicial or administrative decision, subject staying in a health or social establishment, adult under legal protection and finally patient in emergency situation, * Pregnant or breastfeeding women, women of childbearing age who do not have effective contraception (hormonal/mechanical: per os, injectable, transcutaneous, implantable, intrauterine device, or surgical: tubal ligation, hysterectomy, total oophorectomy)