Types of and Location of Cerebral Aneurysms

Cerebral aneurysms are classified both by size and shape.

Cerebral aneurysms usually occur at the bifurcations and branches of the large arteries located at the Circle of Willis. Approximately 85% of aneurysms develop in the anterior part of the circle of Willis, and involve the internal carotid arteries and their major branches that supply the anterior and middle sections of the brain.

The most common sites include the:

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The majority of cerebral aneurysms occur in the anterior portion of the Circle of Willis.

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