Doctor insights on:
What Is A Brain Aneurysm Caused By
Cause unknown: The vast majority of intracranial aneurysms occur sporadically and the cause is unknown. It is likely that there is a genetic predisposition of certain people that have a weakness in the construction of the arterial wall that overtime bulges out and forms an aneurysm. ...Read moreSee 1 more doctor answer
Congenital: The classic teaching has been that there is a congenital defect in the walls of the blood vessels from which the aneurysm arises. This is at the juncture of the vessels usually at the base of the skull in what is called the circle of willis. This allows the growth of the aneurysm over time. This is exacerbated by hypertension or smoking. Persons with polycystic kidney disease have increased risk. ...Read more
Incompletely known: This is incompletely understood. It starts with a localized weakness in blood vessels, no known way to predict in whom. Risk factors include cigarette smoking, high blood pressure, increasing age, rare predisposing weaknesses of arteries known as "familial aneurysms" and some rare predisposing conditions, which your doctor should evaluate. If headaches are present, get screening with mri/mra. ...Read more
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