In berry aneurysms, is a full-blown aneurysm present at birth, and which layer is weakened?

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Multiple Choice

In berry aneurysms, is a full-blown aneurysm present at birth, and which layer is weakened?

Explanation:
Berry aneurysms come from a congenital defect in the tunica media of cerebral arteries, especially at branch points in the circle of Willis. Because the weakened layer is the media, the wall of the aneurysm is abnormally thin and largely lacks the normal muscular layer, making it prone to rupture. A full aneurysm is not present at birth; it develops over years under arterial pressure as the weakened segment dilates. So the correct idea is that a full aneurysm is not present at birth, and the layer that is weakened is the tunica media.

Berry aneurysms come from a congenital defect in the tunica media of cerebral arteries, especially at branch points in the circle of Willis. Because the weakened layer is the media, the wall of the aneurysm is abnormally thin and largely lacks the normal muscular layer, making it prone to rupture. A full aneurysm is not present at birth; it develops over years under arterial pressure as the weakened segment dilates. So the correct idea is that a full aneurysm is not present at birth, and the layer that is weakened is the tunica media.

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