ArachnoidArachnoid CystsSubarachnoid SpaceDura MaterSubdural SpaceSyringomyeliaArachnoiditisMeningesCranial SinusesHematoma, SubduralCentral Nervous System CystsCraniotomyMagnetic Resonance ImagingCranial Fossa, PosteriorCranial Fossa, MiddleSubdural EffusionForamen MagnumHerniaNeurosurgical ProceduresGranulation TissueCerebrospinal FluidSpinal Cord CompressionMeningiomaSpinal Cord DiseasesTomography, X-Ray ComputedHydrocephalusDecompression, SurgicalSacrococcygeal RegionPneumoencephalographyCerebral VentriculographyLaminectomyHeadacheNeuroendoscopyDelayed DiagnosisCerebrospinal Fluid ShuntsMeningeal NeoplasmsTrephiningHypothalamic DiseasesPrenatal DiagnosisEncephaloceleSella TurcicaEarly DiagnosisIophendylateHematoma, Subdural, ChronicCerebrospinal Fluid PressurePetrous BoneCystsCisterna MagnaSensitivity and SpecificityKeratin-8Nerve Compression SyndromesParietal BoneMyelographyFiresetting BehaviorCerebrospinal Fluid RhinorrheaCranial Nerve DiseasesCerebellar DiseasesMeningoceleIntracranial HypertensionRetrospective StudiesHemifacial SpasmCerebellopontine AngleDiagnosis