dissected vertebral artery Vertebral artery dissection http://en.wikipedia.org/wiki/Vertebral_artery_dissection vertebral artery dissection vertebral artery dissection Vertebral artery dissections http://en.wikipedia.org/wiki/Vertebral_artery_dissection Vertebral artery dissection http://en.wikipedia.org/wiki/Vertebral_artery_dissection Vertebral artery dissection Vertebral artery dissection