Which artery is least likely to harbor a berry aneurysm among PCA, ACA, MCA, and ICA?

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Study for the CVP and GI Pathology Exam 1. Engage with flashcards and multiple-choice questions, each with hints and explanations. Prepare thoroughly for your test!

Multiple Choice

Which artery is least likely to harbor a berry aneurysm among PCA, ACA, MCA, and ICA?

Explanation:
Berry aneurysms form most often at branch points in the Circle of Willis where wall stress concentrates and there may be inherent vessel wall weakness. The anterior communicating artery is the most common site, with the middle cerebral artery at its bifurcation and the internal carotid artery regions (including the junctions near the posterior communicating artery) also being frequent locations. The posterior cerebral artery itself has fewer high-stress branching points, so aneurysms there are comparatively rare. Therefore, the posterior cerebral artery is the least likely to harbor a berry aneurysm among the options.

Berry aneurysms form most often at branch points in the Circle of Willis where wall stress concentrates and there may be inherent vessel wall weakness. The anterior communicating artery is the most common site, with the middle cerebral artery at its bifurcation and the internal carotid artery regions (including the junctions near the posterior communicating artery) also being frequent locations. The posterior cerebral artery itself has fewer high-stress branching points, so aneurysms there are comparatively rare. Therefore, the posterior cerebral artery is the least likely to harbor a berry aneurysm among the options.

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