I also have a progav shunt, since 2008. I had obstructive hydrocephalus due to a tumor. The shunt has worked beautifully, I have MRI's every 3 months and still no adjustments needed! The only problem I am experiencing is it feels like I am forming adhesions around the tubing in my chest. Has anybody else experienced anything like this and if so is there anything that can be done to fix it? Thank you!!