Anterior Cerebral ArteryInfarction, Anterior Cerebral ArteryCerebral ArteriesIntracranial AneurysmCerebral AngiographyAneurysm, RupturedMiddle Cerebral ArteryCircle of WillisVertebral ArterySubarachnoid HemorrhageBasilar ArteryArteriesCerebral InfarctionCerebral Arterial DiseasesCerebrovascular CirculationInfarction, Middle Cerebral ArteryCerebellumTomography, X-Ray ComputedCerebellar DiseasesEmbolization, TherapeuticPosterior Cerebral ArteryMagnetic Resonance AngiographyCarotid Artery, InternalCerebral RevascularizationUltrasonography, Doppler, TranscranialLateral Medullary SyndromeCarotid ArteriesVertebrobasilar InsufficiencyMagnetic Resonance ImagingAngiography, Digital SubtractionIntracranial Arteriovenous MalformationsNeurosurgical ProceduresBrain IschemiaCraniotomyAneurysm, DissectingAkinetic MutismBlood Flow VelocityBrain Stem InfarctionsIntracranial Embolism and ThrombosisEchoencephalographyBrainVasospasm, IntracranialArterial Occlusive DiseasesParietal Cells, GastricIschemic Attack, TransientSurgical InstrumentsPulmonary ArteryHemifacial SpasmVertebral Artery DissectionRupture, SpontaneousBrain Hemorrhage, TraumaticDominance, CerebralTreatment OutcomeIntracranial ArteriosclerosisCerebrovascular DisordersMoyamoya DiseaseRenal ArteryFemoral ArteryCerebral HemorrhageMesenteric ArteriesTrigeminal NeuralgiaUltrasonography, DopplerParietal BoneFrontal LobeCaloric TestsCarotid Artery DiseasesRegional Blood FlowVertigoBrain InfarctionCarotid StenosisStrokeCerebellopontine AngleRetrospective StudiesIliac ArteryCoronary Artery BypassCollateral CirculationHematomaRadial ArteryUltrasonographyFacial Nerve DiseasesMicrosurgeryFollow-Up StudiesMammary ArteriesImaging, Three-DimensionalSubclavian ArteryTemporal ArteriesNerve Compression SyndromesTime FactorsElectronystagmographyCarotid Artery, CommonCerebral PalsyBrachial ArterySplenic ArteryUmbilical ArteriesVasoconstrictionCranial Fossa, PosteriorCranial Nerve DiseasesHepatic ArteryPostoperative ComplicationsCoronary Vessels