A relatively frequent cause of subarachnoid hemorrhage is rupture of a saccular aneurysm. Most aneurysms occur at the bifurcation of large cerebral arteries. Over 90% of aneurysms occur in the circle of Willis and in the proximal middle cerebral artery. An aneurysm is caused by a focal weakening and thinning of the arterial wall. Rupture of an aneurysm can result in subarachnoid hemorrhage but it can also produce intracerebral hemorrhage and necrosis. Vasospasm and hydrocephalus (secondary to obstruction of arachnoid granulations) may be consequences of aneurysmal rupture. Rarely an unruptured aneurysm will reach a size capable of producing a mass effect on the brain.
Aneurysm of Basilar Artery
- Stroke Assessment Scales Overview
- Stroke Assessment Scales
- Stroke Syndromes
- Alexia without Agraphia
- Ataxic Hemiparesis
- Balint Syndrome
- Claude Syndrome
- Cortical Blindness (Anton Syndrome)
- Gerstmann Syndrome
- Inferior Medial Pontine Syndrome (Foville Syndrome)
- Lateral Medullary Syndrome (Wallenberg Syndrome)
- Lateral Pontine Syndrome (Marie-Foix Syndrome)
- Locked-in Syndrome
- Medial Medullary Syndrome (Dejerine Syndrome)
- Middle Cerebral Artery – Inferior Division
- Middle Cerebral Artery – Superior Division
- Posterior Cerebral Artery – Unilateral Occipital
- Thalamic Pain Syndrome (Dejerine-Roussy Syndrome)
- Ventral Pontine Syndrome (Millard-Gubler Syndrome)
- Ventral Pontine Syndrome (Raymond Syndrome)
- Weber Syndrome
- Imaging Techniques
- MRI Compared to CT
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