Posterior Cerebral ArteryBasilar ArteryIntracranial AneurysmEmbolization, TherapeuticAneurysm, RupturedCerebral AngiographyInfarction, Posterior Cerebral ArterySubarachnoid HemorrhageAneurysmCerebral ArteriesCircle of WillisVertebrobasilar InsufficiencyVertebral ArteryCerebral InfarctionAneurysm, InfectedArteriesCerebrovascular CirculationAortic AneurysmTomography, X-Ray ComputedHemianopsiaCerebral Arterial DiseasesTreatment OutcomeAnterior Cerebral ArteryMiddle Cerebral ArteryAortic Aneurysm, ThoracicHeart AneurysmAneurysm, DissectingAngiography, Digital SubtractionCarotid Artery, InternalUltrasonography, Doppler, TranscranialMagnetic Resonance ImagingMagnetic Resonance AngiographyIliac AneurysmBrainBrain IschemiaCarotid ArteriesVasospasm, IntracranialBlood Flow VelocityCoronary AneurysmInfarction, Middle Cerebral ArteryIntracranial Embolism and ThrombosisArterial Occlusive DiseasesPulmonary ArteryBlood Vessel Prosthesis ImplantationOccipital LobeRenal ArteryIntracranial Arteriovenous MalformationsBrain Stem InfarctionsVasoconstrictionAneurysm, FalseOculomotor Nerve DiseasesFemoral ArteryCerebrovascular DisordersIntracranial ArteriosclerosisVasodilationDyslexia, AcquiredIschemic Attack, TransientMoyamoya DiseaseRetrospective StudiesMuscle, Smooth, VascularAortic RuptureCerebral PalsyIliac ArteryCerebral RevascularizationFollow-Up StudiesBlood Vessel ProsthesisCarotid Artery DiseasesMesenteric ArteriesEndovascular ProceduresStentsOphthalmoplegic MigraineAorta, AbdominalCranial Fossa, PosteriorAngiographyTonic PupilTime FactorsAmobarbitalCollateral CirculationVascular Surgical ProceduresAnisocoriaDominance, CerebralAortographySplenic ArterySubclavian ArteryRegional Blood FlowCerebral HemorrhageEchoencephalographyConstriction, PathologicHemiplegiaDogsCoronary Artery BypassSurgical InstrumentsEclampsiaCerebral VeinsNeurologic ExaminationImage Processing, Computer-AssistedCarotid StenosisPostoperative ComplicationsBlood PressureVasodilator Agents