Cavernous SinusCarotid Artery, InternalCarotid Artery DiseasesCarotid ArteriesCavernous Sinus ThrombosisCarotid StenosisCarotid Artery, ExternalCerebral AngiographyCarotid Artery, CommonCarotid Artery, Internal, DissectionCarotid Artery ThrombosisEndarterectomy, CarotidCarotid-Cavernous Sinus FistulaAngiography, Digital SubtractionSphenoid SinusIntracranial AneurysmArterial Occlusive DiseasesMagnetic Resonance AngiographyCerebral ArteriesTomography, X-Ray ComputedEmbolization, TherapeuticSphenoid BoneArteriesCerebrovascular CirculationUltrasonography, Doppler, DuplexCircle of WillisIschemic Attack, TransientVertebral ArteryAbducens Nerve DiseasesCerebral RevascularizationCranial SinusesEndarterectomyCarotid SinusCentral Nervous System Vascular MalformationsPetrous BoneOphthalmoplegiaAngiographyCranial Nerve DiseasesAneurysmCerebrovascular DisordersCranial NervesIntracranial Embolism and ThrombosisBlood Flow VelocityOphthalmic ArteryStentsHorner SyndromeCarotid Artery InjuriesCranial Fossa, MiddleMagnetic Resonance ImagingCollateral CirculationArteriovenous FistulaTunica IntimaUltrasonography, Doppler, TranscranialDura MaterCerebral InfarctionBrain IschemiaMiddle Cerebral ArteryBalloon OcclusionTreatment OutcomeOculomotor Nerve DiseasesNeurosurgical ProceduresStrokeSella TurcicaSinus Thrombosis, IntracranialCerebral VeinsIntracranial EmbolismSkull BaseTunica MediaFibromuscular DysplasiaUltrasonography, Doppler, ColorBasilar ArteryAngioplasty, BalloonEpistaxisUltrasonographyMoyamoya DiseaseCarotid BodyIntracranial ArteriosclerosisAmaurosis FugaxMaxillary SinusAngioplastyMeningeal ArteriesArteriosclerosisAneurysm, RupturedPituitary NeoplasmsTemporal ArteriesFollow-Up StudiesCatheterizationParanasal SinusesAnterior Cerebral ArteryRetrospective StudiesSinus of ValsalvaCarotid Intima-Media ThicknessIntracranial Arteriovenous MalformationsCerebral Arterial DiseasesAneurysm, FalseConstriction, PathologicTime FactorsProspective StudiesInjections, Intra-ArterialImaging, Three-Dimensional