Vertebral ArteryVertebral Artery DissectionVertebrobasilar InsufficiencyAneurysm, DissectingArteriesDissectionBasilar ArterySubclavian ArteryCerebral AngiographySubclavian Steal SyndromeCarotid Artery, Internal, DissectionLateral Medullary SyndromeMagnetic Resonance AngiographyCarotid ArteriesAngiographyCerebral ArteriesCarotid Artery, InternalIntracranial AneurysmPulmonary ArteryTomography, X-Ray ComputedAngiography, Digital SubtractionNeck DissectionEmbolization, TherapeuticBrain Stem InfarctionsCervical VertebraeArterial Occlusive DiseasesNeck InjuriesCervical AtlasSubarachnoid HemorrhageAortic AneurysmFemoral ArteryRenal ArteryFibromuscular DysplasiaStentsAneurysm, RupturedAxisMesenteric ArteriesBlood CirculationCarotid Artery, CommonCarotid Artery DiseasesTreatment OutcomeOccipital BoneCerebrovascular CirculationMammary ArteriesCerebellar DiseasesAneurysm, FalseIliac ArteryConstriction, PathologicCoronary Artery BypassAtlanto-Axial JointRegional Blood FlowDoppler EffectCerebral RevascularizationRadial ArteryCarotid Artery, ExternalCerebral InfarctionNeckIntracranial ArteriosclerosisFollow-Up StudiesVertigoArteriovenous FistulaUltrasonography, Doppler, ColorAneurysmPercussionMagnetic Resonance ImagingUltrasonography, DopplerAngioplasty, BalloonAortic Aneurysm, ThoracicTime FactorsRetrospective StudiesPulmonary CirculationMastoidAtlanto-Occipital JointExtracorporeal CirculationBlood Vessel Prosthesis ImplantationAortographyCoronary VesselsMesenteric Artery, SuperiorSplenic ArteryBrain IschemiaUltrasonographyBlood Flow VelocityBlood Vessel ProsthesisBrachial ArteryAorta, ThoracicCeliac ArteryCerebrovascular DisordersUltrasonography, Doppler, TranscranialHepatic ArteryWounds, StabEndovascular ProceduresCarotid StenosisCadaverUltrasonography, Doppler, DuplexInfarctionCerebellumIntracranial Embolism and ThrombosisHeadacheCollateral CirculationHemifacial Spasm