so ms doest cause ccsvi because
-lots of people's ccsvi is for sure congenital. bone defects etc.
-when restenosis occurs its the clearest cause/effect model we have. The ccsvi is back so the ms is back.
ms causes ccsvi because:
-there is a clear mapping of progression. worse ccsvi means worse ms and this progresses over time.
-ms causes lots of other systemic effects. this is just another