Multiple Sclerosis (MS) is an inflammatory disease of the brain leading to disability. Brain MRI is very useful for MS diagnosis but prognostic biomarkers are still needed. New therapies are also expected to improve MS care. Cytokine arrays provide measure of many different inflammation-related molecules that could help understanding the disease. Moreover, individual prognosis could be linked with the level of such molecules in the CSF of MS patients. The investigators will analyze the cytokine profile of MS and control patients CSF to determine a specific profile of MS and look for prognosis implication in a cohort of patients with clinically isolated syndromes (first manifesatation of MS).