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Images obtained from a 74-year-old man who presented with a sudden headache. (a) TOF-MRA shows focal dilatation of the right vertebral artery (arrow). (b) Z-HB axial image of the dilated segment of the vertebral artery. The intimal flap is clearly visualized as a hyperintense line (arrow). TOF-MRA (c) and CTA (d) axial image of the dilated segment shows no intravascular signal change based on the observer’s eyes. Z-HB, zoomed high-resolution black blood.
