AstrocytomaCerebellar NeoplasmsHypothalamic NeoplasmsOptic Nerve NeoplasmsAstrocytesThalamic DiseasesBrain NeoplasmsAntineoplastic ProtocolsOptic ChiasmHypothalamus, AnteriorNeurofibromatosis 1CraniopharyngiomaSupratentorial NeoplasmsProto-Oncogene Proteins B-rafGliomaMagnetic Resonance ImagingComparative Genomic HybridizationInfratentorial NeoplasmsGlioblastomaAnaplasiaOligodendrogliomaBrain Stem NeoplasmsGlial Fibrillary Acidic ProteinGangliogliomaGenes, Neurofibromatosis 1EpendymomaNeurofibromin 1Cranial Nerve NeoplasmsCentral Nervous System NeoplasmsImmunohistochemistryBrainSpinal Cord NeoplasmsCells, Cultured