Answer :

Final answer:

The most common cause of atraumatic Subarachnoid Hemorrhage (SAH) is a ruptured aneurysm, which leads to a hemorrhagic stroke characterized by bleeding into the brain and increased pressure on brain tissue.

Explanation:

The most common cause of atraumatic Subarachnoid Hemorrhage (SAH) is a rupture of an aneurysm. An aneurysm is a balloon-like bulge in an artery that can stretch and burst, leading to bleeding into the brain. This type of hemorrhagic stroke results in bleeding into the brain because of the damaged blood vessel, causing accumulated blood to fill a region of the cranial vault and exert pressure on the surrounding brain tissue. This pressure can lead to loss of function, compromised blood flow, and the development of edema due to the breakdown of the blood-brain barrier.

Hemorrhagic strokes are serious medical emergencies, and though they account for only about 10 percent of all strokes, they are more likely to be fatal than ischemic strokes. Surgery may sometimes be necessary to open the cranium and alleviate pressure to prevent further damage to the brain. CT scans are commonly used to diagnose hemorrhagic strokes, revealing the areas of bleeding within the brain's tissues.

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