Vertebral ArteryVertebral Artery DissectionVertebrobasilar InsufficiencyArteriesBasilar ArterySubclavian ArteryCerebral AngiographySubclavian Steal SyndromeLateral Medullary SyndromeCarotid ArteriesMagnetic Resonance AngiographyAneurysm, DissectingCerebral ArteriesCarotid Artery, InternalAngiographyPulmonary ArteryIntracranial AneurysmCervical VertebraeEmbolization, TherapeuticAngiography, Digital SubtractionBrain Stem InfarctionsCervical AtlasArterial Occlusive DiseasesNeck InjuriesTomography, X-Ray ComputedSubarachnoid HemorrhageCarotid Artery, Internal, DissectionAxisRenal ArteryFemoral ArteryFibromuscular DysplasiaMesenteric ArteriesAneurysm, RupturedOccipital BoneCarotid Artery, CommonCarotid Artery DiseasesMammary ArteriesCerebellar DiseasesStentsTreatment OutcomeAneurysm, FalseAtlanto-Axial JointIliac ArteryCoronary Artery BypassConstriction, PathologicDoppler EffectPercussionArteriovenous FistulaCerebral RevascularizationCarotid Artery, ExternalRadial ArteryVertigoIntracranial ArteriosclerosisFollow-Up StudiesMagnetic Resonance ImagingAneurysmCerebral InfarctionUltrasonography, Doppler, ColorAtlanto-Occipital JointCerebrovascular CirculationMastoidUltrasonography, DopplerAngioplasty, BalloonNeckHeadacheWounds, StabUltrasonographySplenic ArteryBrachial ArteryRegional Blood FlowHemifacial SpasmBrain IschemiaCerebrovascular DisordersUltrasonography, Doppler, DuplexCerebellumCarotid StenosisHepatic ArteryRetrospective StudiesInfarctionUltrasonography, Doppler, TranscranialTime FactorsIntracranial Embolism and ThrombosisCoronary VesselsBalloon OcclusionCeliac ArteryProspective StudiesBone ScrewsSpinal InjuriesMesenteric Artery, SuperiorOphthalmic ArteryBrachiocephalic TrunkAngioplastyCarotid Artery InjuriesStrokeBlood Flow VelocityWounds, NonpenetratingCentral Nervous System Vascular MalformationsRisk FactorsMiddle Cerebral ArteryRupture, Spontaneous