Cerebral AngiographyCarotid ArteriesCarotid Artery, InternalCarotid Artery DiseasesCarotid StenosisCarotid Artery, CommonAngiographyMagnetic Resonance AngiographyCerebral ArteriesAngiography, Digital SubtractionCarotid Artery, ExternalEndarterectomy, CarotidCarotid Artery ThrombosisCoronary AngiographyIntracranial AneurysmArteriesCerebral InfarctionTomography, X-Ray ComputedVertebral ArterySubarachnoid HemorrhageCerebrovascular CirculationIntracranial Arteriovenous MalformationsIschemic Attack, TransientBasilar ArteryCerebrovascular DisordersArterial Occlusive DiseasesMiddle Cerebral ArteryBrain IschemiaCircle of WillisCarotid Artery, Internal, DissectionMoyamoya DiseaseCerebral VeinsCarotid BodyAneurysm, RupturedEndarterectomyIntracranial Embolism and ThrombosisCerebral RevascularizationCranial SinusesCerebral HemorrhageEmbolization, TherapeuticTunica IntimaPosterior Cerebral ArteryCarotid SinusCentral Nervous System Vascular MalformationsMagnetic Resonance ImagingIntracranial ArteriosclerosisStentsBlood Flow VelocityIntracranial EmbolismCerebral Arterial DiseasesPulmonary ArteryTreatment OutcomeFemoral ArteryBrainRadial ArteryProspective StudiesTunica MediaCatheterizationStrokeVasospasm, IntracranialUltrasonography, Doppler, DuplexContrast MediaTime FactorsVertebrobasilar InsufficiencyAnterior Cerebral ArteryFluorescein AngiographyConstriction, PathologicTemporal ArteriesCollateral CirculationRenal ArteryCavernous SinusUltrasonographyRisk FactorsFollow-Up StudiesUltrasonography, Doppler, TranscranialInfarction, Middle Cerebral ArteryCarotid Intima-Media ThicknessCarotid Artery InjuriesAngioplasty, BalloonSensitivity and SpecificityArteriovenous FistulaRetrospective StudiesCerebral PalsyMesenteric ArteriesVasculitis, Central Nervous SystemSubclavian ArteryNeurologic ExaminationArteriosclerosisAngioplastyCraniotomyCoronary Artery BypassCarotid-Cavernous Sinus FistulaNeurosurgical ProceduresSinus Thrombosis, IntracranialVertebral Artery DissectionPredictive Value of TestsIliac ArteryCoronary VesselsEpilepsy, Tonic-ClonicArteriovenous Malformations