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FIG 4. A and B, DSA images of the left common carotid artery demonstrate an extremely severe stenosis (arrow) at the origin f the internal carotid artery in the early phase (A), with collapse of the distal lumen ("string" sign [arrowheads]) in the delayed phase (B).
C and D, The 3D contrast-enhanced MR angiographic MIP images (1.5 magnification factor) demonstrate the extremely severe stenosis (arrow in C) at the origin of the internal carotid artery and opacification of the collapsed distal lumen in only the delayed phase (arrowheads in D).
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