Types Of Hydrocephalus

The condition is caused by the inability of CSF to drain away into the bloodstream.

Hydrocephalus may be communicating or non-communicating:

Communicating Hydrocephalus

This occurs when the flow of CSF is blocked after it exits from the ventricles.  This form is called communicating because the CSF can still flow between the ventricles, which remain open. 

Non-Communicating Hydrocephalus

This may also be referred to as "obstructive" Hydrocephalus and occurs when the flow of CSF is blocked along one or more of the narrow pathways connecting the ventricles.