SyringomyeliaArnold-Chiari MalformationArachnoiditisPlatybasiaForamen MagnumDecompressive CraniectomyCerebrospinal Fluid PressureEncephaloceleArachnoid CystsFourth VentricleIncidenceMyelographySubarachnoid SpaceCranial Fossa, PosteriorDecompression, SurgicalMagnetic Resonance ImagingLaminectomyBirth InjuriesArachnoidScoliosisCerebrospinal FluidHydrocephalusSpinal CordArthropathy, NeurogenicDura MaterReflex, AbdominalCerebrospinal Fluid ShuntsSpinal Cord NeoplasmsCerebellar DiseasesHypohidrosisSpinal Cord InjuriesHypesthesia