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A 24 year-old woman presented with right neck pain and a right Horner's syndrome after a mild motor vehicle accident. Otherwise her neurologic examination was normal.
Magnetic Resonance Angiogram - Both Carotid Arteries - note the "string sign" of the right internal carotid, compared to the normal image of the left internal carotid artery. Although not specific for dissection, this pattern is highly suggestive.
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