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Radiographic features of vertebral artery dissection. (A,B) Fusiform dilatation in DSA and MRA. (C–F) Stenosis with dilatation called a string of pearls signs in DSA and HR-VWI. (G,H) Double-lumen sign in HR-VWI. (I–K) Dissecting aneurysm in HR-VWI. Abbreviations: DSA, digital subtraction angiography; MRA, magnetic resonance angiography; HR-VWI, high-resolution vessel wall imaging.
