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This adolescent male presenting with obstructive hydrocephalus underwent an endoscopic third ventriculostomy (ETV) with simultaneous CSF sampling that confirmed a non-germinomatous germ cell tumor (NGGCT). Sagittal post-contrast MRI scans at diagnosis (left), after induction chemotherapy with normalization of tumor markers (center), and after second-look surgery via a supracerebellar infratentorial approach.
