Nerve Sheath NeoplasmsNeurofibromatosis 1Neurofibroma, PlexiformNeurofibromaPeripheral Nervous System NeoplasmsGenes, Neurofibromatosis 1NeurilemmomaNeurofibromin 1Sarcoma, SynovialNeurofibromatosesS100 ProteinsSoft Tissue NeoplasmsSchwann CellsThoracic NeoplasmsSarcomaEpithelioid CellsHMGA ProteinsScalpPeripheral NervesImmunohistochemistryTumor Markers, BiologicalThighFatal OutcomeMagnetic Resonance ImagingCell Line, TumorReverse Transcriptase Polymerase Chain ReactionTissue Array AnalysisCell ProliferationSciatic NerveTomography, X-Ray ComputedCell Transformation, NeoplasticNervous System NeoplasmsPeripheral Nerve InjuriesIn Situ Hybridization, FluorescenceGene Expression Regulation, NeoplasticHemangiopericytomaNeurothekeomaLiposarcomaTranslocation, GeneticGene Expression ProfilingOncogene Proteins, FusionImmunoenzyme TechniquesSignal TransductionOptic NerveAntineoplastic AgentsHorse DiseasesXenograft Model Antitumor AssaysDog DiseasesPrognosisCafe-au-Lait SpotsOligonucleotide Array Sequence AnalysisMutation