Cerebral AngiographyAngiographyMagnetic Resonance AngiographyAngiography, Digital SubtractionCerebral ArteriesCoronary AngiographyIntracranial AneurysmCerebral InfarctionSubarachnoid HemorrhageIntracranial Arteriovenous MalformationsTomography, X-Ray ComputedMiddle Cerebral ArteryCerebrovascular CirculationCerebral VeinsCranial SinusesCarotid Artery, InternalVertebral ArteryMoyamoya DiseaseCerebral HemorrhagePosterior Cerebral ArteryIschemic Attack, TransientCerebrovascular DisordersCircle of WillisCentral Nervous System Vascular MalformationsAneurysm, RupturedBrain IschemiaMagnetic Resonance ImagingCerebral Arterial DiseasesIntracranial Embolism and ThrombosisArterial Occlusive DiseasesCerebral RevascularizationFluorescein AngiographyBasilar ArteryVasospasm, IntracranialEmbolization, TherapeuticInfarction, Middle Cerebral ArteryAnterior Cerebral ArteryBrainCerebral PalsyCarotid Artery DiseasesVasculitis, Central Nervous SystemCarotid StenosisContrast MediaVertebrobasilar InsufficiencySinus Thrombosis, IntracranialEar, MiddleIntracranial ArteriosclerosisBlood Flow VelocityCraniotomyBlindness, CorticalArteriovenous FistulaCollateral CirculationEpilepsy, Tonic-ClonicEndarterectomyIntracranial EmbolismCarotid ArteriesArteriovenous MalformationsNeurologic ExaminationNeurosurgical ProceduresHematoma, SubduralCranial Fossa, AnteriorSensitivity and SpecificityProspective StudiesConstriction, PathologicTreatment OutcomeCarotid-Cavernous Sinus FistulaCavernous SinusVertebral Artery DissectionTemporal ArteriesSurgical InstrumentsHematoma, Subdural, IntracranialMalaria, CerebralUltrasonography, Doppler, TranscranialFollow-Up StudiesComaTime FactorsHeadacheRetrospective StudiesLateral Medullary SyndromeIntracranial HemorrhagesHematomaAneurysm, InfectedRadionuclide AngiographyRemission, SpontaneousCatheterizationStrokeRupture, SpontaneousCarotid Artery ThrombosisDura MaterImaging, Three-DimensionalUltrasonographyRadial ArteryCoronary Artery DiseasePneumonia, AspirationRisk FactorsEndarterectomy, CarotidAneurysm, DissectingCoronary StenosisTomography, Spiral ComputedRecurrence