Acquired Obstructive Hydrocephalus

Acquired obstructive hydrocephalus may occur at any age and from various causes. Intracerebral mass lesions, especially tumors, may obstruct the flow of the CSF at any point within the ventricles. The ventricles dilate proximal to the block and remain of normal size distal to it. Acute obstruction within the subarachnoid space results from meningitis and subarachnoid hemorrhage. Chronic obstruction results from postinflammatory and posthemorrhagic fibrosis of the leptomeninges, neoplastic infiltration, and fibrous thickening of the leptomeninges in some neurometabolic diseases (e.g., mucopolysaccharidosis).

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