Vertebral Artery DissectionVertebral ArteryCerebral AngiographyAneurysm, DissectingLateral Medullary SyndromeCarotid Artery, Internal, DissectionVertebrobasilar InsufficiencyMagnetic Resonance AngiographyIntracranial AneurysmSubarachnoid HemorrhageHeadacheAngiographyTomography, X-Ray ComputedChiropracticCerebral InfarctionNeck PainAngiography, Digital SubtractionMagnetic Resonance ImagingCoronary AneurysmBasilar ArteryCerebral ArteriesCoronary AngiographyCarotid Artery, InternalDissectionArteriesAneurysm, RupturedEmbolization, TherapeuticCarotid Artery DiseasesIntracranial Arteriovenous MalformationsFibromuscular DysplasiaFollow-Up StudiesSubclavian ArteryCarotid ArteriesAnticoagulantsHorner SyndromeCerebrovascular CirculationArterial Occlusive DiseasesNeck InjuriesRupture, SpontaneousCerebrovascular DisordersBrain IschemiaSubclavian Steal SyndromeTreatment OutcomeStentsIntracranial Embolism and ThrombosisBrain Stem InfarctionsCerebral RevascularizationCentral Nervous System Vascular MalformationsMiddle Cerebral ArteryCircle of WillisRenal ArteryIschemic Attack, TransientPosterior Cerebral ArteryCerebral VeinsHematomaCranial SinusesMoyamoya DiseaseMesenteric Artery, SuperiorPulmonary ArteryIntracranial ArteriosclerosisRetrospective StudiesCerebral HemorrhageNeckPuerperal DisordersArteriovenous FistulaCerebral Arterial DiseasesCarotid StenosisConstriction, PathologicAortic AneurysmHypoglossal Nerve DiseasesStrokeAneurysm, FalseTime FactorsUltrasonography, Doppler, TranscranialInfarctionCeliac ArteryProspective StudiesContrast MediaRemission, SpontaneousBrainBlood Flow VelocityCoronary VesselsRadial ArteryVasospasm, IntracranialCranial Nerve DiseasesSensitivity and SpecificityFluorescein AngiographyCoronary Artery BypassNeck DissectionCervical VertebraeWounds, NonpenetratingFemoral ArteryCraniotomyNeurologic ExaminationAnterior Cerebral Artery