Ischemic Attack, TransientStrokeCerebrovascular DisordersCarotid StenosisBrain IschemiaEndarterectomy, CarotidCarotid Artery DiseasesPrognosisRecurrenceRisk FactorsAspirinCarotid Artery, InternalProspective StudiesCerebral InfarctionIntracranial Embolism and ThrombosisFollow-Up StudiesIntracranial EmbolismCerebral AngiographyTime FactorsPlatelet Aggregation InhibitorsTreatment OutcomeDipyridamoleUltrasonography, Doppler, TranscranialMagnetic Resonance AngiographyAtrial FibrillationCarotid ArteriesAnticoagulantsRisk AssessmentEchocardiography, TransesophagealTomography, X-Ray ComputedRetrospective StudiesPredictive Value of TestsCerebrovascular CirculationCohort StudiesEmbolismVertebrobasilar InsufficiencySeverity of Illness IndexFibrinolytic AgentsGreat BritainAge FactorsEndarterectomyIncidenceReferral and ConsultationIntracranial ArteriosclerosisIntracranial Arterial DiseasesNeurologyPatient SelectionAmaurosis FugaxSecondary PreventionEnglandMoyamoya DiseaseCerebral HemorrhageCerebral ArteriesMagnetic Resonance ImagingRiskMigraine DisordersForamen Ovale, PatentAcute DiseaseDiffusion Magnetic Resonance ImagingEmergency Medical ServicesWarfarinInfarction, Posterior Cerebral ArteryMyocardial InfarctionReflex, BabinskiArterial Occlusive DiseasesSulfinpyrazoneAuscultationComorbidityIntracranial HemorrhagesBrainAngiographyCerebral RevascularizationCarotid Artery ThrombosisTiclopidineStentsAngioplastyCardiovascular DiseasesPostoperative ComplicationsRegistriesIntracranial ThrombosisNeurologic ExaminationUltrasonography, Doppler, DuplexHypertensionConstriction, PathologicBrain InfarctionMyocardial IschemiaVascular DiseasesComplement Membrane Attack ComplexBlindnessHeart DiseasesIschemiaSurvival AnalysisUltrasonographyMultivariate AnalysisProportional Hazards ModelsThromboembolismSex FactorsEmbolism, ParadoxicalFibromuscular DysplasiaAngioplasty, Balloon