Arnold-Chiari MalformationSyringomyeliaEncephaloceleKlippel-Feil SyndromeCranial Fossa, PosteriorBrain Hemorrhage, TraumaticHydrocephalusForamen MagnumMagnetic Resonance ImagingPlatybasiaMeningomyeloceleDecompression, SurgicalSubarachnoid SpaceDecompressive CraniectomyPelvic BonesSpinal CanalCerebrospinal Fluid PressureOsteotomyOccipital BoneCerebrospinal FluidSpinal DysraphismHeadache Disorders, PrimaryCraniotomyHip Dislocation, CongenitalBudd-Chiari SyndromeCervical VertebraeArachnoidDura MaterDandy-Walker SyndromeHip DislocationBone Diseases, DevelopmentalAtlanto-Axial Joint