A brain aneurysm is an abnormal bulge in a brain artery that develops where the blood vessel wall is weakened. Visualize the artery as a garden hose. If the rubber in a section of the hose becomes thinner, the hose will develop a balloon-like bulge at that point. While the hose may still work, water pressure could cause leaks in the stretched-out hose wall or even cause the hose to burst. Similarly, a brain aneurysm may allow blood to leak into the subarachnoid space around the brain, causing damage to brain cells. The brain aneurysm also may rupture, causing a serious and perhaps fatal stroke.
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