Cerebral AngiographyRadiologyAngiographyMagnetic Resonance AngiographyAngiography, Digital SubtractionRadiology Department, HospitalRadiology, InterventionalCoronary AngiographyCerebral ArteriesIntracranial AneurysmCerebral InfarctionTomography, X-Ray ComputedSubarachnoid HemorrhageIntracranial Arteriovenous MalformationsCerebrovascular CirculationCerebral VeinsCranial SinusesVertebral ArteryMoyamoya DiseaseCarotid Artery, InternalCerebral HemorrhagePosterior Cerebral ArteryIschemic Attack, TransientCircle of WillisCentral Nervous System Vascular MalformationsCerebrovascular DisordersMiddle Cerebral ArteryAneurysm, RupturedMagnetic Resonance ImagingBrain IschemiaEmbolization, TherapeuticFluorescein AngiographyIntracranial Embolism and ThrombosisCerebral RevascularizationVasospasm, IntracranialBasilar ArteryArterial Occlusive DiseasesCerebral Arterial DiseasesContrast MediaAnterior Cerebral ArteryCerebral PalsyVasculitis, Central Nervous SystemCarotid Artery DiseasesBrainCarotid StenosisVertebrobasilar InsufficiencySinus Thrombosis, IntracranialIntracranial ArteriosclerosisBlindness, CorticalSensitivity and SpecificityCraniotomyArteriovenous FistulaEpilepsy, Tonic-ClonicEndarterectomyCollateral CirculationTeleradiologyArteriovenous MalformationsBlood Flow VelocityCarotid ArteriesIntracranial EmbolismNeurologic ExaminationNeurosurgical ProceduresProspective StudiesConstriction, PathologicHematoma, SubduralTreatment OutcomeCranial Fossa, AnteriorInfarction, Middle Cerebral ArteryRetrospective StudiesCarotid-Cavernous Sinus FistulaCavernous SinusDiagnostic ImagingVertebral Artery DissectionMalaria, CerebralSurgical InstrumentsTemporal ArteriesFollow-Up StudiesHematoma, Subdural, IntracranialRadiographic Image EnhancementTime FactorsHematomaComaLateral Medullary SyndromeUltrasonographyHeadacheCatheterizationRadiographyRadionuclide AngiographyIntracranial HemorrhagesAneurysm, InfectedRadiography, InterventionalRemission, SpontaneousImaging, Three-DimensionalRadiographic Image Interpretation, Computer-AssistedRupture, SpontaneousUltrasonography, Doppler, TranscranialCarotid Artery ThrombosisStrokeDura MaterRadial Artery