Basilar ArteryAneurysmIntracranial AneurysmAneurysm, InfectedArteriesVertebrobasilar InsufficiencyAortic AneurysmSplenic ArteryBehcet SyndromeTomography, X-Ray ComputedCerebral AngiographyFemoral ArteryAngiographyIliac ArteryAneurysm, RupturedAortic Aneurysm, ThoracicHeart AneurysmSubarachnoid HemorrhageVertebral ArteryAneurysm, DissectingCerebral ArteriesEmbolization, TherapeuticIntracranial Arteriovenous MalformationsVascular Surgical ProceduresIliac AneurysmTreatment OutcomeCoronary AneurysmPulmonary ArteryCarotid ArteriesBlood Vessel Prosthesis ImplantationRenal ArteryAngiography, Digital SubtractionAneurysm, FalseBrain Stem InfarctionsCarotid Artery, InternalVasospasm, IntracranialAortic RuptureBlood Vessel ProsthesisMesenteric ArteriesEndovascular ProceduresAorta, AbdominalCarotid Artery DiseasesStentsVasodilationAortographyVasoconstrictionSubclavian ArteryMuscle, Smooth, VascularArterial Occlusive DiseasesCoronary Artery BypassCircle of WillisCeliac ArteryCerebrovascular CirculationRadial ArteryDogsMiddle Cerebral ArteryMesenteric Artery, SuperiorMammary ArteriesFollow-Up StudiesSurgical InstrumentsCarotid Artery, CommonVasodilator AgentsRetrospective StudiesMagnetic Resonance AngiographyPosterior Cerebral ArteryHepatic ArteryTime FactorsSerotoninPostoperative ComplicationsDilatation, PathologicAnterior Cerebral ArteryBrachial ArteryOphthalmic ArteryPopliteal ArteryCoronary VesselsRabbitsPapaverinePotassium ChlorideIntracranial Embolism and ThrombosisVasoconstrictor AgentsMuscle ContractionIntracranial ThrombosisTemporal ArteriesPicolinesIschemic Attack, TransientEndothelium, VascularProsthesis DesignMechanical ThrombolysisUltrasonography, Doppler, TranscranialSumatriptanIntracranial ArteriosclerosisNeurosurgical ProceduresVertebral Artery DissectionAcetylcholineRenal Artery ObstructionThoracic ArteriesBronchial ArteriesAngioplastyUlnar ArteryCerebral Infarction