Budd-Chiari SyndromeRadiology, InterventionalPortasystemic Shunt, Transjugular IntrahepaticSyringomyeliaSyndromeForamen MagnumHemangiopericytomaFocal Nodular HyperplasiaAngiomyomaLiver NeoplasmsSpinal NeoplasmsCarcinoma, HepatocellularEncephalocelePlatybasiaTomography, X-Ray ComputedHemangiomaCranial Fossa, PosteriorEmbolization, TherapeuticMagnetic Resonance ImagingFerrosoferric OxideContrast MediaMeningomyeloceleAngiographySkull NeoplasmsNeovascularization, PathologicDecompression, SurgicalSubarachnoid SpaceMagnetic Resonance AngiographyOxidesDecompressive CraniectomyDown SyndromePelvic BonesSpinal CanalCerebrospinal Fluid PressureMetabolic Syndrome XOsteotomySensitivity and SpecificityUltrasonography, Doppler, Color