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Vertebral Artery Dissection

A 42 year-old man developed severe right neck pain following minor trauma. He also noted transient vertigo and right facial numbness.

Show the Small Right Vertebral Artery

Magnetic resonance angiogram of the posterior circulation. Note the normal caliber of the left vertebral and basilar arteries. However, the right vertebral is poorly seen, only a small amount of flow is seen. This picture could result from a congenital hypoplastic vertebral or from a dissection and a subsequent "string sign".

Revised 04/26/06.
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