Vertebrobasilar InsufficiencyVertebral ArterySubclavian Steal SyndromeBasilar ArterySubclavian ArteryVertigoCerebral AngiographyArterial Occlusive DiseasesArteriesAdrenal InsufficiencyRenal InsufficiencyVenous InsufficiencyIntracranial AneurysmVertebral Artery DissectionCarotid ArteriesExocrine Pancreatic InsufficiencyMagnetic Resonance AngiographyPulmonary ArteryCerebral ArteriesPlacental InsufficiencyAngiography, Digital SubtractionRenal ArteryFemoral ArteryCarotid Artery, InternalIschemic Attack, TransientInfarction, Posterior Cerebral ArteryAngiographyMesenteric ArteriesIntracranial ArteriosclerosisTomography, X-Ray ComputedAngioplasty, BalloonStentsAneurysm, DissectingCarotid Artery DiseasesPetrous BoneTreatment OutcomeEchoencephalographyTrigeminal NeuralgiaIntracranial Embolism and Thrombosis