Cerebellar DiseasesBrain Stem InfarctionsCerebellumHemifacial SpasmIntracranial AneurysmAneurysm, RupturedBasilar ArteryCaloric TestsVertebrobasilar InsufficiencyCerebellopontine AngleVertebral ArteryCerebral AngiographyLateral Medullary SyndromeNerve Compression SyndromesSubarachnoid HemorrhageMagnetic Resonance ImagingPosterior Cerebral ArteryArteriesVertebral Artery DissectionEmbolization, TherapeuticVertigoRupture, SpontaneousTomography, X-Ray ComputedFacial Nerve DiseasesAneurysm, DissectingCerebral RevascularizationTrigeminal NeuralgiaMicrosurgeryCranial Fossa, PosteriorCraniotomyCerebral InfarctionCentral Nervous System Vascular MalformationsMagnetic Resonance AngiographyAngiography, Digital SubtractionBrain InfarctionIntracranial Arteriovenous MalformationsNeurosurgical ProceduresTemporal LobeCerebral ArteriesVena Cava, InferiorTreatment OutcomeMedulla OblongataPulmonary ArteryInferior ColliculiElectronystagmographyAkinetic MutismCranial Nerve DiseasesCarotid ArteriesSurgical InstrumentsRenal ArteryFemoral ArteryMesenteric ArteriesTrigeminal NerveImaging, Three-DimensionalIliac ArteryCoronary Artery BypassRadial ArteryMesenteric Artery, InferiorMammary ArteriesCarotid Artery, InternalSubclavian ArteryCarotid Artery DiseasesSplenic ArteryRetrospective StudiesBrachial ArteryFollow-Up StudiesHepatic ArteryCerebrovascular CirculationCarotid Artery, CommonCoronary VesselsCeliac ArteryMesenteric Artery, SuperiorOphthalmic ArteryUmbilical ArteriesMiddle Cerebral ArteryThoracic ArteriesRenal Artery ObstructionTemporal ArteriesBronchial ArteriesPopliteal ArteryUlnar ArteryCoronary AngiographyAngiographyUterine ArteryCarotid Artery, ExternalTime FactorsVasodilationArterial Occlusive Diseases