Cerebral AngiographyAngiographyMagnetic Resonance AngiographyAngiography, Digital SubtractionCoronary AngiographyCerebral ArteriesIntracranial AneurysmTomography, X-Ray ComputedCerebral InfarctionSubarachnoid HemorrhageIntracranial Arteriovenous MalformationsCerebrovascular CirculationCerebral VeinsCranial SinusesVertebral ArteryMoyamoya DiseaseCarotid Artery, InternalCerebral HemorrhagePosterior Cerebral ArteryIschemic Attack, TransientCircle of WillisCentral Nervous System Vascular MalformationsCerebrovascular DisordersObserver VariationMiddle Cerebral ArteryAneurysm, RupturedMagnetic Resonance ImagingSuperficial Back MusclesBrain IschemiaReproducibility of ResultsFluorescein AngiographyIntracranial Embolism and ThrombosisCerebral RevascularizationVasospasm, IntracranialBasilar ArteryEmbolization, TherapeuticArterial Occlusive DiseasesCerebral Arterial DiseasesAnterior Cerebral ArteryCerebral PalsyTreatment OutcomeSensitivity and SpecificityVasculitis, Central Nervous SystemCarotid Artery DiseasesBrainContrast MediaCarotid StenosisVertebrobasilar InsufficiencySinus Thrombosis, IntracranialIntracranial ArteriosclerosisProspective StudiesBlindness, CorticalCraniotomyArteriovenous FistulaEpilepsy, Tonic-ClonicRetrospective StudiesEndarterectomyCollateral CirculationTime FactorsArteriovenous MalformationsBlood Flow VelocityCarotid ArteriesIntracranial EmbolismNeurologic ExaminationNeurosurgical ProceduresHematoma, SubduralFollow-Up StudiesCranial Fossa, AnteriorInfarction, Middle Cerebral ArteryConstriction, PathologicCarotid-Cavernous Sinus FistulaCavernous SinusVertebral Artery DissectionMalaria, CerebralSurgical InstrumentsTemporal ArteriesHematoma, Subdural, IntracranialComaLateral Medullary SyndromeHeadacheRadionuclide AngiographyIntracranial HemorrhagesAneurysm, InfectedPredictive Value of TestsHematomaRemission, SpontaneousCatheterizationRupture, SpontaneousUltrasonography, Doppler, TranscranialCarotid Artery ThrombosisDura MaterRadial ArteryImaging, Three-DimensionalUltrasonographyStrokeCoronary Artery DiseasePneumonia, AspirationEndarterectomy, CarotidAneurysm, DissectingCoronary Stenosis