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Stent – A tubular structure made of wire mess that is used by the neuroradiologist or neurosurgeon in the endovascular treatment of aneurysms. In cases of aneurysm that have large openings (wide neck), the stent is placed in the artery across the opening of the aneurysm in order to endure that the coils stay within the aneurysm.

Stroke – A disability caused by injury to the brain regardless of the cause. Most stroke are caused by loss of blood flow to a portion of the brain or by injury related to bleeding within the brain.

Subarachnoid Hemorrhage (SAH) – Bleeding into the space around the brain (the subarachnoid space). This occurs when an aneurysm ruptures, but it may also result from other causes of bleeding around the brain including a head injury from trauma. Subarachnoid hemorrhage from a ruptured cerebral aneurysm can lead to a hemorrhagic stroke, brain damage and death.