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Hemorrhagic Stroke – A stroke caused by a ruptured blood vessel and characterized by bleeding within or surrounding the brain. Subarachnoid hemorrhage from a ruptured cerebral aneurysm can lead to a hemorrhagic stroke.

Hydrocephalus – A generic term that describes too much fluid building up within the spaces inside the brain (also known as ventricles). This may occur after aneurysm rupture or bleeding from an AVM and may be life-threatening. Emergency treatment with placement of a drainage tube to relieve the pressure may be required (see below – ventriculostomy).