Vertebral ArteryVertebral Artery DissectionVertebrobasilar InsufficiencySubclavian Steal SyndromeSubclavian ArteryCerebral AngiographyCoronary-Subclavian Steal SyndromeArteriesBasilar ArteryAneurysm, DissectingTomography, X-Ray ComputedLateral Medullary SyndromeDissectionMagnetic Resonance AngiographyCarotid Artery, Internal, DissectionCarotid ArteriesCerebral ArteriesAngiographyCarotid Artery, InternalIntracranial AneurysmPulmonary ArteryCervical VertebraeEmbolization, TherapeuticAngiography, Digital SubtractionBrain Stem InfarctionsArterial Occlusive DiseasesCervical AtlasNeck InjuriesSubarachnoid HemorrhageRenal ArteryFemoral ArteryAxisFibromuscular DysplasiaAneurysm, RupturedMesenteric ArteriesCarotid Artery, CommonStentsOccipital BoneCarotid Artery DiseasesMammary ArteriesCerebellar DiseasesTreatment OutcomeAneurysm, FalseIliac ArteryCoronary Artery BypassConstriction, PathologicAtlanto-Axial JointDoppler EffectRadial ArteryPercussionVertigoCarotid Artery, ExternalCerebral RevascularizationArteriovenous FistulaIntracranial ArteriosclerosisAneurysmCerebral InfarctionUltrasonography, Doppler, ColorNeckFollow-Up StudiesAngioplasty, BalloonNeck DissectionAtlanto-Occipital JointUltrasonography, DopplerCerebrovascular CirculationMastoidMagnetic Resonance ImagingAortic AneurysmSplenic ArteryWounds, StabRegional Blood FlowUltrasonographyCoronary VesselsBrachial ArteryHemifacial SpasmBrain IschemiaHepatic ArteryCerebrovascular DisordersUltrasonography, Doppler, DuplexCerebellumRetrospective StudiesInfarctionCarotid StenosisMesenteric Artery, SuperiorUltrasonography, Doppler, TranscranialHeadacheCeliac ArteryIntracranial Embolism and Thrombosis