Cerebral AngiographyAngiographyMagnetic Resonance AngiographyAngiography, Digital SubtractionCoronary AngiographyCerebral ArteriesIntracranial AneurysmCerebral InfarctionSubarachnoid HemorrhageIntracranial Arteriovenous MalformationsTomography, X-Ray ComputedCerebrovascular CirculationCerebral VeinsCranial SinusesVertebral ArteryCarotid Artery, InternalMoyamoya DiseaseCerebral HemorrhagePosterior Cerebral ArteryIschemic Attack, TransientCerebrovascular DisordersCentral Nervous System Vascular MalformationsCircle of WillisAneurysm, RupturedMiddle Cerebral ArteryBrain IschemiaIntervention StudiesMagnetic Resonance ImagingFluorescein AngiographyCerebral RevascularizationIntracranial Embolism and ThrombosisArterial Occlusive DiseasesVasospasm, IntracranialBasilar ArteryEmbolization, TherapeuticTreatment OutcomeCerebral Arterial DiseasesCerebral PalsyAnterior Cerebral ArteryBrainCarotid Artery DiseasesVasculitis, Central Nervous SystemContrast MediaCarotid StenosisVertebrobasilar InsufficiencySinus Thrombosis, IntracranialIntracranial ArteriosclerosisProspective StudiesFollow-Up StudiesCraniotomyBlindness, CorticalArteriovenous FistulaCollateral CirculationEpilepsy, Tonic-ClonicEndarterectomyTime FactorsBlood Flow VelocityArteriovenous MalformationsCarotid ArteriesNeurosurgical ProceduresNeurologic ExaminationIntracranial EmbolismSensitivity and SpecificityConstriction, PathologicRetrospective StudiesHematoma, SubduralCranial Fossa, AnteriorInfarction, Middle Cerebral ArteryRisk FactorsCarotid-Cavernous Sinus FistulaCavernous SinusVertebral Artery DissectionSurgical InstrumentsMalaria, CerebralTemporal ArteriesHematoma, Subdural, IntracranialComaHeadacheLateral Medullary SyndromeHematomaCatheterizationIntracranial HemorrhagesAneurysm, InfectedStrokeRadionuclide AngiographyRemission, SpontaneousCoronary Artery DiseaseRadial ArteryRupture, SpontaneousUltrasonography, Doppler, TranscranialCarotid Artery ThrombosisImaging, Three-DimensionalRecurrenceDura MaterUltrasonographyCoronary StenosisPredictive Value of TestsPneumonia, AspirationStentsAneurysm, Dissecting