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 IschemiaMagnetic Resonance ImagingFluorescein AngiographySensitivity and SpecificityIntracranial Embolism and ThrombosisVasospasm, IntracranialCerebral RevascularizationBasilar ArteryEmbolization, TherapeuticArterial Occlusive DiseasesCerebral Arterial DiseasesCerebral PalsyAnterior Cerebral ArteryContrast MediaBrainVasculitis, Central Nervous SystemCarotid Artery DiseasesCarotid StenosisSinus Thrombosis, IntracranialVertebrobasilar InsufficiencyIntracranial ArteriosclerosisBlindness, CorticalCraniotomyArteriovenous FistulaEpilepsy, Tonic-ClonicEndarterectomyCollateral CirculationArteriovenous MalformationsBlood Flow VelocityProspective StudiesNeurologic ExaminationCarotid ArteriesNeurosurgical ProceduresIntracranial EmbolismHematoma, SubduralTreatment OutcomeInfarction, Middle Cerebral ArteryCranial Fossa, AnteriorRetrospective StudiesConstriction, PathologicCarotid-Cavernous Sinus FistulaCavernous SinusVertebral Artery DissectionFollow-Up StudiesTemporal ArteriesSurgical InstrumentsMalaria, CerebralTime FactorsHematoma, Subdural, IntracranialComaHeadachePredictive Value of TestsLateral Medullary SyndromeHematomaUltrasonographyIntracranial HemorrhagesRadionuclide AngiographyAneurysm, InfectedRemission, SpontaneousReproducibility of ResultsCatheterizationRupture, SpontaneousUltrasonography, Doppler, TranscranialImaging, Three-DimensionalCarotid Artery ThrombosisDura MaterRadial ArteryStrokeCoronary Artery DiseaseRisk FactorsPneumonia, AspirationTomography, Spiral ComputedCoronary StenosisAneurysm, DissectingEndarterectomy, Carotid