Before revision: Noncommunicating Noncommunicating hydrocephalus, or obstructive hydrocephalus, is caused by an obstruction to the flow of CSF.
After revision: 75px|thumbnail|An adult with congenital hydrocephalus in the PhilippinesNoncommunicating Noncommunicating hydrocephalus, or obstructive hydrocephalus, is caused by an obstruction to the flow of CSF.