Cerebral AngiographyAngiographyMagnetic Resonance AngiographyAngiography, Digital SubtractionCoronary AngiographyCerebral ArteriesIntracranial AneurysmCerebral InfarctionTomography, X-Ray ComputedSubarachnoid HemorrhageIntracranial Arteriovenous MalformationsCerebrovascular CirculationCerebral VeinsCranial SinusesVertebral ArteryCarotid Artery, InternalMoyamoya DiseaseCerebral HemorrhagePosterior Cerebral ArteryIschemic Attack, TransientCerebrovascular DisordersCircle of WillisCentral Nervous System Vascular MalformationsMiddle Cerebral ArteryAneurysm, RupturedBrain IschemiaMagnetic Resonance ImagingFluorescein AngiographyIntracranial Embolism and ThrombosisCerebral RevascularizationVasospasm, IntracranialBasilar ArteryEmbolization, TherapeuticArterial Occlusive DiseasesCerebral Arterial DiseasesCerebral PalsyAnterior Cerebral ArteryBrainContrast MediaCarotid Artery DiseasesVasculitis, Central Nervous SystemCarotid StenosisVertebrobasilar InsufficiencySinus Thrombosis, IntracranialIntracranial ArteriosclerosisBlindness, CorticalCraniotomyEpilepsy, Tonic-ClonicArteriovenous FistulaCollateral CirculationEndarterectomyArteriovenous MalformationsBlood Flow VelocityCarotid ArteriesNeurologic ExaminationSensitivity and SpecificityNeurosurgical ProceduresIntracranial EmbolismHematoma, SubduralProspective StudiesInfarction, Middle Cerebral ArteryCranial Fossa, AnteriorConstriction, PathologicTreatment OutcomeCarotid-Cavernous Sinus FistulaCavernous SinusVertebral Artery DissectionRetrospective StudiesSurgical InstrumentsMalaria, CerebralHematoma, Subdural, IntracranialTemporal ArteriesFollow-Up StudiesComaHeadacheLateral Medullary SyndromeTime FactorsHematomaIntracranial HemorrhagesImaging, Three-DimensionalAneurysm, InfectedRadionuclide AngiographyRemission, SpontaneousCatheterizationRupture, SpontaneousUltrasonography, Doppler, TranscranialUltrasonographyCarotid Artery ThrombosisDura MaterStrokeRadial ArteryTomography, Spiral ComputedCoronary Artery DiseasePneumonia, AspirationImage Processing, Computer-AssistedEndarterectomy, CarotidPredictive Value of TestsAneurysm, DissectingRisk FactorsCoronary Stenosis