Vertebral Artery DissectionVertebral ArteryAneurysm, DissectingCarotid Artery, Internal, DissectionLateral Medullary SyndromeVertebrobasilar InsufficiencyCerebral AngiographyMagnetic Resonance AngiographyAtlanto-Occipital JointOccipital BoneHeadacheNeck PainChiropracticIntracranial AneurysmSubarachnoid HemorrhageCoronary AneurysmCervical VertebraeTomography, X-Ray ComputedMagnetic Resonance ImagingAtlanto-Axial JointForamen MagnumDissectionCerebral InfarctionCervical AtlasBasilar ArteryArteriesNeckAxisAngiographyHypoglossal Nerve DiseasesFibromuscular DysplasiaCarotid Artery, InternalSubclavian ArteryAnticoagulantsHorner SyndromeArnold-Chiari MalformationNeck InjuriesCranial Fossa, PosteriorSubclavian Steal SyndromeFollow-Up StudiesBrain Stem InfarctionsAngiography, Digital SubtractionTreatment OutcomeCarotid ArteriesStentsCarotid Artery DiseasesRenal ArteryRupture, SpontaneousSkull BaseEmbolization, TherapeuticMesenteric Artery, SuperiorPuerperal DisordersPulmonary ArterySpinal Cord CompressionHyoid BoneDystoniaAnti-Dyskinesia AgentsNeck MusclesSyringomyeliaOdontoid ProcessCerebral ArteriesDystonic DisordersAortic AneurysmAneurysm, RupturedDislocationsArteriovenous FistulaLongitudinal LigamentsNeck DissectionInfarctionCineradiographyCentral Nervous System Vascular MalformationsAneurysm, FalseCranial Nerve DiseasesRetrospective StudiesCeliac ArteryArterial Occlusive DiseasesWounds, NonpenetratingHematoma