Artery dissection

What is a cerebral artery dissection/dissecting cerebral aneurysm?

The wall of the cerebral arteries has a three-layer structure, consisting (from the inside) of the tunica intima, the tunica media, and the tunica externa.

When the tunica intima and the tunica media split, allowing blood to flow into the vascular wall and causing it to rupture, this is called a cerebral artery dissection.

The rupture in the vascular wall causes the internal lumen of the blood vessel to narrow.


Sometimes, the outside of the vascular wall thins, and the blood vessel may expand and bulge outwards. This bulge is called a dissecting cerebral aneurysm.


page top