Arachnoid CystsArachnoidCystsSubdural SpaceSyringomyeliaArachnoiditisCentral Nervous System CystsSubarachnoid SpaceCranial Fossa, MiddleHematoma, SubduralCranial Fossa, PosteriorForamen MagnumCraniotomySubdural EffusionCyst FluidDura MaterNeurosurgical ProceduresSacrococcygeal RegionSpinal Cord CompressionHerniaMagnetic Resonance ImagingNeuroendoscopyMembranesCerebral VentriculographyDecompression, SurgicalLaminectomyOvarian CystsIophendylateSpinal Cord DiseasesHeadacheCerebrospinal Fluid ShuntsCell MembraneMembrane LipidsHypothalamic DiseasesEpidermal CystIntracellular MembranesCisterna MagnaPetrous BoneFiresetting BehaviorSella TurcicaHydrocephalusTrephiningHematoma, Subdural, ChronicMembrane PotentialsCerebellar DiseasesMembranes, ArtificialTomography, X-Ray ComputedVentriculoperitoneal ShuntCranial Nerve DiseasesBarotraumaMeningocele