What is extraventricular obstructive hydrocephalus and what is its treatment?

Slow absorption: Cerebral spinal fluid is produced inside the ventricles, cycles through the ventricular system, and then passes out side the ventricles to be absorbed. Obstruction within the ventricles produces internal hydrocephalus. A defect in absorption outside the ventricles will also produce hydrocephalus which is external. This type is often referred to as external or communicating hydrocephalus.