An aneurysm is an outpouching of a blood vessel wall. This can occur anywhere there are blood vessels, including in the brain. The bulging, blood-filled pocket can put pressure on parts of the brain, potentially causing symptoms. In addition, the blood vessel can rupture (hemorrhage). Early detection and diagnosis may help prevent severe or fatal complications in some patients. Many aneurysms go unnoticed for a lifetime and cause no symptoms.

Brain Aneurysm
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Aneurysms form in areas where the artery wall becomes thin or weak. Thinning artery walls and resulting aneurysms can be caused by a number of factors. Common causes include:

  • Congenital (present at birth) weakness in artery wall
  • High blood pressure
  • Infection
  • Trauma or injury to the brain
  • Tumor
  • Plaque build-up on artery walls