Hydrocephalus means there is a build-up of cerebrospinal also called CSF, around the brain. Download PDF 626.09KB. Like a bathtub with the water on and a partially clogged drain, fluid can’t drain fast enough. The purpose of CSF is to protect the brain and spinal cord.
https://www.spinabifidaassociation.org/resource/hydrocephalus-and-shunts/

