MeningiomaMeningeal NeoplasmsArachnoidSkull NeoplasmsMagnetic Resonance ImagingBrain NeoplasmsHyperostosisSkull Base NeoplasmsCerebellopontine AngleDura MaterTomography, X-Ray ComputedNeuroma, AcousticGenes, Neurofibromatosis 2HemangiopericytomaOptic Nerve NeoplasmsNeurosurgical ProceduresDelayed DiagnosisEar NeoplasmsPrenatal DiagnosisEarly DiagnosisNeurilemmomaSensitivity and SpecificityCraniotomyNeurofibromatosis 2Cerebral Ventricle NeoplasmsMeningesRetrospective StudiesForamen MagnumChromosomes, Human, Pair 22Neurofibromin 2Diagnosis