I wonder if you have symptoms of high ICP? Sometimes that is enough to try Diamox to help figure out if external communicating hydrocephalus is part of the problem. Your MRI, like mine, hints at the possibility of too much CSF in the subarachnoid space above the brain, and supports the idea that you *may* respond to Diamox. Your sella looks good — which is great. Like many of us, it looks like it hurts to bend your neck (your discs bulge a bit). Are you showing us these because you’re considering a neck fusion, I wonder?