The most common intracranial aneurysm is a berry aneurysm located in which vascular territory?

The most common intracranial aneurysm is a berry aneurysm located in which vascular territory?

• A. Circle of Willis
• B. Basilar artery
• C. Internal carotid artery
• D. Middle cerebral artery

Answer: (A)

Berry (saccular) aneurysms arise at arterial branch points where the vessel wall is stressed. In the brain, these stress-prone sites are most common within the Circle of Willis, where major arteries divide and form junctions. The classic frequent site is at the junctions involving the anterior communicating artery with the anterior cerebral arteries, though other bifurcations in the Circle of Willis can also harbor them. This is why the Circle of Willis is the vascular territory most associated with the common intracranial berry aneurysm. While aneurysms can occur along other intracranial arteries such as the basilar artery or middle cerebral artery, they are not as commonly the most frequent location.

Berry (saccular) aneurysms arise at arterial branch points where the vessel wall is stressed. In the brain, these stress-prone sites are most common within the Circle of Willis, where major arteries divide and form junctions. The classic frequent site is at the junctions involving the anterior communicating artery with the anterior cerebral arteries, though other bifurcations in the Circle of Willis can also harbor them. This is why the Circle of Willis is the vascular territory most associated with the common intracranial berry aneurysm. While aneurysms can occur along other intracranial arteries such as the basilar artery or middle cerebral artery, they are not as commonly the most frequent location.