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Fig. 6A. —Right internal carotid artery dissection in 42-year-old woman with right-sided neck pain and oculosympathetic paresis (Horner's syndrome). Source image from CT angiogram shows marked narrowing of right internal carotid artery (curved arrow) compared with left internal carotid artery (straight arrow) because of dissection. Note that soft tissue immediately surrounding artery does not differ from normal muscle (unlike appearance seen on MR image in Figure 5A, 5B, 5C, 5D).