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Fig 3. CT/CTA and MR imaging/MRA provide different advantages in this case of right ICA dissection, but diagnosis is made with equal confidence on both techniques. A and B, Noncontrast CT image (A) shows mild hypoattenuation involving the right basal ganglia (arrow), confirmed as an acute stroke with DWI (B). C, Axial source image from CTA shows expansion of the outer wall of the right ICA consistent with wall thickening as well as narrowing of the vessel lumen (arrow). D, Axial T1-weighted fat-suppressed MR image demonstrates a crescent sign (arrow) around the right ICA.
