VentriculostomyThird VentricleHydrocephalusNeuroendoscopyCerebral AqueductUltrasonic Surgical ProceduresEndoscopyCerebrospinal Fluid PressureVentriculoperitoneal ShuntCerebrospinal Fluid ShuntsCerebral VentriculographyCerebral VentriclesNeurosurgical ProceduresCraniotomyHeadacheMagnetic Resonance Imaging, Cine