There is a high prevalence of abnormal delayed flow through the IJVs in patients with MS.

http://www.jvir.org/article/S1051-0443(13)01393-6/abstract


Internal Jugular Veins Outflow in Patients with Multiple Sclerosis: A Catheter Venography Study
www.jvir.org
Journal of Vascular and Interventional Radiology, Volume null, Issue null, Pages null, null, Authors:Pierfrancesco Veroux, MD; Alessia Giaquinta, MD; Debora Perricone, MD; Lorenzo Lupo, MD; Flavia Gentile, MD; Carla Virgilio, MD; Anna Carbonaro, MD; Concetta De Pasquale, MD; Massimiliano Veroux, MD,...