Connective TissueNeuroectodermal Tumors, PrimitiveNeuroectodermal TumorsNeuroectodermal Tumors, Primitive, PeripheralHistocytochemistryNeuroectodermal Tumor, MelanoticSarcoma, EwingMedulloblastomaConnective Tissue DiseasesConnective Tissue Growth FactorCerebellar NeoplasmsSupratentorial NeoplasmsBrain NeoplasmsProto-Oncogene Protein c-fli-1RNA-Binding Protein EWSConnective Tissue CellsMixed Connective Tissue DiseasePinealomaChromosomes, Human, Pair 22EpendymomaSpinal Cord NeoplasmsSarcoma, Small CellBone NeoplasmsNeuroblastomaRhabdoid TumorMaxillary NeoplasmsTumor Markers, BiologicalNeoplasms, Germ Cell and EmbryonalThoracic NeoplasmsCentral Nervous System NeoplasmsImmunohistochemistry