GerminomaPineal GlandBrain NeoplasmsDysgerminomaBasal Ganglia DiseasesCranial IrradiationChorionic Gonadotropin, beta Subunit, HumanSella TurcicaNeoplasms, Germ Cell and EmbryonalSpinal Cord NeoplasmsDiabetes InsipidusDiabetes Insipidus, NeurogenicGiant CellsPituitary Function TestsCombined Modality TherapyPituitary DiseasesHistiocytesMeningeal NeoplasmsCentral Nervous System NeoplasmsPituitary NeoplasmsSpinal NeoplasmsFemoral NeoplasmsMagnetic Resonance ImagingEtoposideNeoplasms, Multiple PrimaryMedulla OblongataCorpus CallosumNeoplasm Recurrence, LocalChorionic GonadotropinRadiotherapy, AdjuvantTrophoblasts