Vertebral ArteryBasilar ArteryVertebral Artery DissectionIntracranial AneurysmAneurysmAneurysm, RupturedVertebrobasilar InsufficiencyCerebral AngiographyEmbolization, TherapeuticSubarachnoid HemorrhageArteriesCerebral ArteriesSubclavian ArterySplenic ArteryRenal ArteryPulmonary ArteryCarotid Artery, InternalTomography, X-Ray ComputedCarotid ArteriesAneurysm, InfectedCoronary AneurysmAneurysm, DissectingIliac AneurysmAngiography, Digital SubtractionBrain Stem InfarctionsFemoral ArteryAngiographyMagnetic Resonance AngiographyIliac ArteryAortic AneurysmCarotid Artery DiseasesMesenteric ArteriesTreatment OutcomeArterial Occlusive DiseasesSubclavian Steal SyndromeStentsAneurysm, FalseBlood Vessel Prosthesis ImplantationCeliac ArteryHepatic ArteryPopliteal ArteryMesenteric Artery, SuperiorVasospasm, IntracranialCoronary Artery BypassVascular Surgical ProceduresEndovascular ProceduresMammary ArteriesAortic Aneurysm, ThoracicRadial ArteryCarotid Artery, CommonVasodilationHeart AneurysmCircle of WillisBlood Vessel ProsthesisCarotid Artery, Internal, DissectionCerebrovascular CirculationBronchial ArteriesVasoconstrictionMiddle Cerebral ArteryMuscle, Smooth, VascularOphthalmic ArteryPosterior Cerebral ArteryAnterior Cerebral ArteryFollow-Up StudiesBrachial ArteryCoronary VesselsConstriction, PathologicLateral Medullary SyndromeRetrospective StudiesDogsCerebral RevascularizationIntracranial ArteriosclerosisUlnar ArteryCarotid Artery, ExternalRupture, SpontaneousTemporal ArteriesFibromuscular DysplasiaSurgical InstrumentsIntracranial Embolism and ThrombosisCerebral InfarctionVasodilator AgentsTime FactorsVascular PatencyMagnetic Resonance ImagingMucocutaneous Lymph Node SyndromeUltrasonography, Doppler, TranscranialArteriovenous FistulaIschemic Attack, TransientAortographyRenal Artery ObstructionCoronary AngiographyAorta, AbdominalIntracranial ThrombosisSerotoninNeurosurgical ProceduresRegional Blood FlowPostoperative ComplicationsAngioplastyAxillary ArteryThoracic Arteries