What are common sites of aneurysms associated with hemorrhagic stroke?

Updated: Apr 22, 2019
  • Author: David S Liebeskind, MD, FAAN, FAHA, FANA; Chief Editor: Andrew K Chang, MD, MS  more...
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Berry aneurysms are most often isolated lesions whose formation results from a combination of hemodynamic stresses and acquired or congenital weakness in the vessel wall. Saccular aneurysms typically occur at vascular bifurcations, with more than 90% occurring in the anterior circulation. Common sites include the following:

  • The junction of the anterior communicating arteries and anterior cerebral arteries—most commonly, the middle cerebral artery (MCA) bifurcation

  • The supraclinoid internal carotid artery at the origin of the posterior communicating artery

  • The bifurcation of the internal carotid artery (ICA)

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