ArachnoidArachnoid CystsSubarachnoid SpaceDura MaterSubdural SpaceSyringomyeliaArachnoiditisMeningesCranial SinusesHematoma, SubduralCentral Nervous System CystsCraniotomyCranial Fossa, MiddleCranial Fossa, PosteriorSubdural EffusionForamen MagnumHerniaGranulation TissueNeurosurgical ProceduresMagnetic Resonance ImagingSpinal Cord CompressionCerebrospinal FluidMeningiomaSpinal Cord DiseasesDecompression, SurgicalHydrocephalusSacrococcygeal RegionPneumoencephalographyCerebral VentriculographyLaminectomyNeuroendoscopyCerebrospinal Fluid ShuntsHeadacheTrephiningHypothalamic DiseasesMeningeal NeoplasmsEncephaloceleIophendylateSella TurcicaHematoma, Subdural, ChronicCerebrospinal Fluid PressurePetrous BoneCisterna MagnaTomography, X-Ray ComputedKeratin-8Firesetting BehaviorCystsCerebrospinal Fluid RhinorrheaParietal BoneHemifacial SpasmMyelographyMeningoceleNerve Compression SyndromesCranial Nerve Diseases