Arachnoid CystsArachnoidCystsSyringomyeliaSubdural SpaceArachnoiditisCentral Nervous System CystsSubarachnoid SpaceCranial Fossa, MiddleHematoma, SubduralCranial Fossa, PosteriorForamen MagnumCraniotomySubdural EffusionCyst FluidDura MaterNeurosurgical ProceduresSacrococcygeal RegionSpinal Cord CompressionHerniaMagnetic Resonance ImagingNeuroendoscopyCerebral VentriculographyDecompression, SurgicalOvarian CystsLaminectomyIophendylateSpinal Cord DiseasesHeadacheCerebrospinal Fluid ShuntsHypothalamic DiseasesEpidermal CystCisterna MagnaPetrous BoneFiresetting BehaviorSella TurcicaHydrocephalusTrephiningHematoma, Subdural, ChronicCerebellar DiseasesTomography, X-Ray ComputedVentriculoperitoneal ShuntCranial Nerve DiseasesBarotraumaMeningocele