Infratentorial NeoplasmsNeuroectodermal Tumors, PrimitiveMutismNeuroectodermal TumorsNeuroectodermal Tumors, Primitive, PeripheralCranial Fossa, PosteriorNeuroblastomaCerebellar NeoplasmsMedulloblastomaSarcoma, EwingBrain NeoplasmsSupratentorial NeoplasmsNeuroectodermal Tumor, MelanoticRNA-Binding Protein EWSProto-Oncogene Protein c-fli-1EpendymomaPinealomaSpinal Cord NeoplasmsChromosomes, Human, Pair 22Rhabdoid TumorSarcoma, Small CellCell Line, TumorBone NeoplasmsCentral Nervous System NeoplasmsTumor Markers, BiologicalThoracic NeoplasmsTomography, X-Ray ComputedMagnetic Resonance ImagingAstrocytomaOrbital NeoplasmsFatal OutcomeIfosfamideNeoplasms, Germ Cell and EmbryonalOncogene Proteins, FusionImmunohistochemistryParaparesisVincristineThoracic WallDandy-Walker SyndromeCranial IrradiationChromosomes, Human, Pair 11Combined Modality TherapyAbdominal NeoplasmsTeratomaEtoposideChromosomes, Human, Pair 17Translocation, GeneticCranial Fossa, MiddlePineal GlandTreatment OutcomeLomustineRhabdomyosarcomaTumor BurdenNeurofilament ProteinsCyclophosphamideAntineoplastic Combined Chemotherapy ProtocolsTumor Necrosis Factor-alphaDNA, NeoplasmArnold-Chiari MalformationSoft Tissue NeoplasmsThiotepaFourth VentricleNeoplasmsIn Situ Hybridization, FluorescenceGliomaCerebellar DiseasesTumor Cells, CulturedNeoplasm Recurrence, Local