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Fig. 5B. —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. Unenhanced axial T1-weighted MR image shows narrowing of flow void of right internal artery with eccentric hyperintense intramural hematoma that expands outer diameter of artery (straight arrow). Note normal caliber of left internal carotid artery (curved arrow).