Feel like I keep banging away at this, but the sooner they start defining the differences the better, this is another keeper I think. A few years ago there was a lot of talk of normal pressure hydrocephalus and Chiari malformations. I wonder whether those got disseminated into the wider neurology community or not. I seem to remember reading also about a different type of arterial study in which there was a twist that affected blood flow? and caused PD like symptoms....... I am never sure whether these kind of findings get followed through, or whether they get overtaken by the next thing........

But this is a very interesting piece of work.