Although it is called “aneurysm”, it is not a tumor. It is a bubble that bulges on the blood vessels in the brain, just like a bubble bulging on a car tire. Due to long-term blood flow impact, the bubble grows and may rupture and bleed at the weak point, causing intracranial hemorrhage, which may lead to sudden and severe headache and vomiting, and in severe cases, death within minutes.
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