... reported blocked veins in barely half of the latest MS patients he has studied, as well as almost one-quarter of his healthy test subjects
This says it all to me. This is the second study that had this kind of finding. Another one found 22%. As I pointed out years ago, people with blocked cerebral veins in their head are more common than people who are left handed.
...so if these blocked veins are the primary cause of MS - why is MS such a rare illness? Only 0.001% of the world's population has MS, yet 25% of the world's poulation have blocked cerebral veins.