I think it makes sense (regarding the atlas) that this is the problem or cause of the stenosis in some people but not in others...so to some reading this (maybe me?) this would be the fix-all and to others (maybe me?) it would not be.
It's like CCSVI is the grand unifying theory of MS...all these bits and pieces, all the ways in which someone with RR is different from someone with progressive, all the unknowns and the treatments that work for some and not for others, finally make sense.
For pathologic valve, I've heard reports here of thickening of the valve membrane to the point that it is obstructive (easily fixed with angioplasty) or the valve being backwards so that instead of keeping blood from refluxing it's actually keeping blood in (also easily fixed by angioplasty). I think problems with valves will show up on transcranial doppler or venogram but not the MRV.
Also -- this is somewhere on the forum -- there is a particular valve in the IJ that is not entirely necessary, as only 90% of the normal population has it, so if it's squeezed out of existence through angioplasty, this is okay and not detrimental as far as we know. (Forgive my stats if they are wrong but this is the general idea.)
"However, the truth in science ultimately emerges, although sometimes it takes a very long time," Arthur Silverstein, Autoimmunity: A History of the Early Struggle for Recognition