Keywords: Brain neoplasm; CSF; Case report; ETV; Endoscopic 3rd ventriculostomy; Endoscopic third ventriculostomy; Hydrocephalus; Intracranial pressure; Pineal gland tumor; Pineal neoplasm; Pineal neoplasm classification; Pineal neoplasm epidemiology; Pineal neoplasm management; Pineal neoplasm pathology; Pineocytoma; Tumor board article; Tumor markers.