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Fig. 5C. —Bilateral internal carotid artery dissections in 44-year-old man who developed right-sided neck pain and right Horner's syndrome a few days after downhill skiing. He had no history of direct trauma. Catheter angiogram of left common carotid artery, lateral view, shows pseudoaneurysm (arrow) resulting from dissection in cervical segment. Because dissection did not extend to skull base, it is not seen in B.