Cerebral AngiographyMagnetic Resonance ImagingMagnetic Resonance AngiographyAngiographyMagnetic Resonance SpectroscopyAngiography, Digital SubtractionCoronary AngiographyCerebral ArteriesIntracranial AneurysmCerebral InfarctionTomography, X-Ray ComputedIntracranial Arteriovenous MalformationsSubarachnoid HemorrhageCerebrovascular CirculationContrast MediaBrainCerebral VeinsCranial SinusesVertebral ArteryCarotid Artery, InternalMoyamoya DiseaseCerebral HemorrhagePosterior Cerebral ArteryIschemic Attack, TransientCerebrovascular DisordersCircle of WillisMagnetic Resonance Imaging, CineCentral Nervous System Vascular MalformationsMiddle Cerebral ArteryAneurysm, RupturedBrain IschemiaCerebral RevascularizationIntracranial Embolism and ThrombosisArterial Occlusive DiseasesBasilar ArteryFluorescein AngiographyCerebral Arterial DiseasesEmbolization, TherapeuticVasospasm, IntracranialSensitivity and SpecificityAnterior Cerebral ArteryCarotid Artery DiseasesCerebral PalsyCarotid StenosisVasculitis, Central Nervous SystemImaging, Three-DimensionalVertebrobasilar InsufficiencyImage Processing, Computer-AssistedSinus Thrombosis, IntracranialCraniotomyGadolinium DTPANeurosurgical ProceduresProspective StudiesIntracranial ArteriosclerosisBlood Flow VelocityDiffusion Magnetic Resonance ImagingTreatment OutcomeNeurologic ExaminationBlindness, CorticalIntracranial EmbolismCarotid ArteriesArteriovenous FistulaEpilepsy, Tonic-ClonicArteriovenous MalformationsTime FactorsCollateral CirculationGadoliniumEndarterectomyHematoma, SubduralReproducibility of ResultsConstriction, PathologicInfarction, Middle Cerebral ArteryPredictive Value of TestsFollow-Up StudiesRetrospective StudiesImage EnhancementCranial Fossa, AnteriorCavernous SinusBrain MappingVertebral Artery DissectionImage Interpretation, Computer-AssistedCarotid-Cavernous Sinus FistulaHeadacheNuclear Magnetic Resonance, BiomolecularHematoma, Subdural, IntracranialTemporal ArteriesSurgical InstrumentsLateral Medullary SyndromeComaUltrasonographyMalaria, CerebralHematomaDura MaterIntracranial HemorrhagesStrokeRemission, SpontaneousCatheterizationRadionuclide AngiographyRupture, SpontaneousHistoriography