The Ventriculoscope is a tiny telescopic camera that is inserted into the ventricle of the brain through a small incision in the scalp and a small hole in the skull. This allows the surgeon to view the fluid and the obstruction. The surgeon then creates a hole in the membrane at the bottom of the ventricle and increases it using a catheter (small tube) with an inflatable balloon. This creates a detour for the CSF to flow around the obstruction and into the rest of the brain for re-absorption