IMO,
Since there are four Jugular veins, two external and two internal, and the Azygos vein in the chest, they all need to be tested for blockage or inverted valves that can cause a back-flow back into the brain, and little back to the heart slowly.

The Carotid arteries bring blood up to the brain and are strong vessels (not not veins) to take the full force of your blood pressure and pump of the heart.

The veins are thin and smaller that drain the blood back down to the heart. I totally believe CCSVI will be our answer. Maybe we are born with it, or maybe something happens to cause this, it seems the more veins blocked, or if a few are badly blocked, the more progressive the MS.

Since it is now considered a "Vascular Disease" (CCSVI) by doctors and labeled as such, the procedure should be easier to test and treat once everyone gets trained and is the same page with knowledge.

It is not considered a MS treatment, because anyone who has a blockage or inverted valves, should have the blockage repaired. It is not healthy or normal to have this. It could cause other diseases and problems just by being blocked.