From the MSRC Website:
Background: Vascular comorbidity adversely influences health outcomes in several chronic conditions.
Vascular comorbidities are common in multiple sclerosis (MS), but their impact on disease severity is unknown. Vascular comorbidities may contribute to the poorly understood heterogeneity in MS disease severity. Treatment of vascular comorbidities may represent an avenue for treating MS. http://www.msrc.co.uk/index.cfm/fuseaction/show/pageid/2944