I saw this study. As I had to have a lumbar drain after each of my MVD's due to CSF leaks out my nose, it caught my eye. Why a trial in Norway would be on the USA site is beyond me. What concerns me is this. Lumbar drains are large needles left in your lower back for five days. It drains off spinal fluid. The spinal headaches are horrific. The drains need to be closely monitored, The assumption everyone is going to get a CSF leak is just that, a assumption, and I question the wisdom in doing them to everyone that has MVD surgery, as a part of surgery.