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neuroanatomy brain tumors brain hydrocephalus anatomy tumor neurosurgery rhoton corpus callosum thalamus choroid plexus lateral ventricle cancer biopsy stereotaxy stereotactic biopsy altered senses locked in syndrome coma akinetic mutism glasgow coma scale gcs medullary velum fourth ventricle treatment of hydrocephalus raised intracranial pressure children surgery fracture skull pediatrics growing skull fracture radiotherapy spine sacrum clivus chordoma incision craniotomy flaps craniotomy embryology neurohypophysis adenohypophysis pituitary ventricular horn forceps minor white matter tract transcallosal third ventricle caudate nucleus foramen of monro csf pathway