Is this the article?
The thing I find interesting about this is, if the below which is quoted from the MS Society of Canada's web page is true...
"Most people (about 80-85%) are diagnosed with the relapsing-remitting form of MS. Over time, from 50 to 70 % of people originally diagnosed with relapsing remitting MS will convert to secondary progressive MS, and will slowly accumulate disability. The remaining number however may have a very mild course continuing with only occasional relapses, generally good recovery, and only minor neurological disturbances accumulating for long periods of time."
Other than saying it is not clearly causitive, would not Dr Zivadinov's work also support the idea that people with more severe vein abnormality might be more likely to develop a more severe form of MS?
Afterall, this study only gives a picture of a group of people at one point (or day) in their lives. It can not tell us what the veins of any of them looked like 20 years or even 20 weeks before the study was completed.