Features of communicating hydrocephalus are as follows: - dilatation of ventricles - free flow of cerebrospinal fluid Features of Non-communicating hydrocephalus: - mechanical blockage prevents free flow of cerebrospinal fluid Reference: https://www.drawittoknowit.com/course/neuroanatomy/glossary/pathophysiologic-disorder/hydrocephalus-communicating-aka-non-obstructive Image via: https://www.drawittoknowit.com/course/neuroanatomy/glossary/pathophysiologic-disorder/hydrocephalus-communicating-aka-non-obstructive