Cognitive impairment among different clinical courses of multiple sclerosis.

Background: As of yet, no consensus has been reached regarding cognitive impairment profiles in multiple sclerosis (MS) patients based on the MS type and disease duration. The main objective of this study was to describe cognitive impairment at the early stages of MS. The secondary objective was to compare cognitive performances in patients with relapsing remitting multiple sclerosis (RRMS), secondary progressive (SP) MS and primary progressive (PP) MS.