The old classification divides hydrocephalus into 2 types: noncommunicating and communicating. In noncommunicating or obstructive hydrocephalus, the CSF accumulates within the ventricles as a result of an obstruction within the ventricular system (most commonly at the level of cerebral aqueduct). In communicating hydrocephalus, the CSF flows freely through the outflow foramens of the fourth ventricles into the arachnoid space.
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