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Diagrams show hypothetical schemes of aneurysm formation (left) and persistent stenosis (right).
Left, Hemodynamic stress from vortex flow inside the cavity may cause external protrusion of the adventitia, which results in a saccular aneurysm.
Right, A large entry zone can produce a massive, widespread subadventitial hematoma of sufficient size to compress the true lumen and result in abrupt occlusion. When the hematoma is large, the artery is likely to remain thrombosed.
