Supratentorial NeoplasmsEpendymomaCraniotomyNeuroectodermal Tumors, PrimitiveCerebellar DiseasesInfratentorial NeoplasmsGlioma, SubependymalCerebral HemorrhageCerebellar NeoplasmsAstrocytomaBrain Stem NeoplasmsBrain NeoplasmsMagnetic Resonance ImagingNeurosurgical ProceduresCranial Fossa, PosteriorGliomaTomography, X-Ray ComputedMedulloblastomaGangliogliomaHematoma, Epidural, CranialHematomaIntracranial PressurePancreatic NeoplasmsCerebral VentriclesCerebral Ventricle NeoplasmsArachnoidMuscle HypertoniaNeoplasmsNeuroectodermal TumorsMeningeal NeoplasmsNeuroendoscopyCerebral Ventriculography