SyringomyeliaForamen MagnumPlatybasiaEncephaloceleCranial Fossa, PosteriorMeningomyeloceleDecompression, SurgicalSubarachnoid SpaceDecompressive CraniectomyPelvic BonesSpinal CanalCerebrospinal Fluid PressureOsteotomyOccipital BoneMagnetic Resonance ImagingCerebrospinal FluidKlippel-Feil SyndromeSpinal DysraphismHeadache Disorders, PrimaryCraniotomyHip Dislocation, CongenitalBudd-Chiari SyndromeHydrocephalusCervical VertebraeArachnoidDura MaterDandy-Walker SyndromeHip DislocationBone Diseases, DevelopmentalAtlanto-Axial JointScoliosisCerebellar DiseasesBrain Hemorrhage, TraumaticNeurosurgical ProceduresPseudotumor CerebriRadiology, InterventionalVentriculostomyCerebrospinal Fluid ShuntsCerebellumLaminectomySpinal StenosisCerebral VentriclesHip JointCranial Nerve DiseasesSpinal Cord DiseasesRhombencephalonRheologySpinal CordOsteoarthritis, HipNeurologic ExaminationTreatment OutcomeHeadacheAsymptomatic DiseasesPortasystemic Shunt, Transjugular IntrahepaticAcetabulumReproducibility of ResultsRetrospective StudiesImaging, Three-DimensionalFollow-Up StudiesTomography, X-Ray ComputedPostoperative ComplicationsBrainSensitivity and SpecificityHeart AtriaUltrasonography, PrenatalPainSeverity of Illness IndexComputer Simulation