Saw another article on the corticospinal tract (CST) that explained that other disorders can do this also, so as this is a step forward, it is not a conclusive diagnostic tool. Wish it were, but it does limit the number of possibilities that need to be ruled out. My MRI did show white matter issues in the CST. Waiting now for further development from my Neuro. They are pushing me to start Radicava now as well so this is persuasive. Been through so many tests, I have become numb now.