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# Subarachnoid Hemorrhage **Note (NB):** In most cases of subarachnoid hemorrhage (85%), there is a ruptured aneurysm. The remaining 15% are non-aneurysmal and have a better prognosis. 5% are due to arteriovenous malformations (AVMs). **Circle of Willis** **(Diagram Description):** A diagram sh...

# Subarachnoid Hemorrhage **Note (NB):** In most cases of subarachnoid hemorrhage (85%), there is a ruptured aneurysm. The remaining 15% are non-aneurysmal and have a better prognosis. 5% are due to arteriovenous malformations (AVMs). **Circle of Willis** **(Diagram Description):** A diagram showing the major arteries supplying the brain. The diagram depicts the Circle of Willis, a circulatory anastomosis that ensures blood supply to the brain. Major arteries including the Anterior Cerebral Arteries, Anterior Communicating Arteries, Middle Cerebral Arteries, Posterior Communicating Arteries, Posterior Cerebral Arteries, Basilar Arteries, and Vertebral Arteries, are labeled. A highlighted region of an artery in the brain is circled. **Most Common Sites for Brain Aneurysms:** * Anterior Communicating Artery: 30% * Posterior Communicating Artery: 25% * Middle Communicating Artery: 25% **People at Risk:** 1. First-degree relatives of those with saccular aneurysms. 2. Patients with autosomal dominant polycystic kidney disease.