TeratomaMediastinumMediastinal NeoplasmsMediastinal DiseasesMediastinal CystTesticular NeoplasmsTomography, X-Ray ComputedThoracotomyMediastinoscopySacrococcygeal RegionRadiography, ThoracicNeoplasms, Germ Cell and EmbryonalRetroperitoneal NeoplasmsMediastinitisBronchogenic CystGoiter, SubsternalDermoid CystThoracic Surgical ProceduresThymus NeoplasmsThoracic Surgery, Video-AssistedDysgerminomaPleural CavityThymomaThoracic NeoplasmsIncidental FindingsChoristomaThoracoscopyOvarian NeoplasmsPneumomediastinum, Diagnostic3-IodobenzylguanidineSeminomaLymphangioma, CysticEmbryonic Stem CellsFatal OutcomeSternumEndodermal Sinus TumorSuperior Vena Cava SyndromeGerminomaAbnormalities, Severe TeratoidEsophageal CystVisible Human ProjectsMediastinoscopesTreatment OutcomeEsophageal PerforationIsochromosomesGanglioneuromaMesonephromaStruma OvariiGastroscopesRupture, SpontaneousCoccyxPlasma Cell Granuloma, PulmonaryParathyroid NeoplasmsPluripotent Stem CellsNeurilemmomaLung NeoplasmsBronchoscopyMediastinal EmphysemaMagnetic Resonance ImagingThymus HyperplasiaLiposarcomaOvarian CystsLymphangiomaChylothoraxHeart NeoplasmsInduced Pluripotent Stem CellsImmunohistochemistryRetroperitoneal SpaceRadiopharmaceuticalsEndosonographyPleuraBiopsy, NeedleThoracostomyThymectomyCell DifferentiationBiopsyHematemesisalpha-FetoproteinsSpermatoceleRadionuclide ImagingGallium RadioisotopesSternotomyNeoplasms, Multiple PrimaryThoracic DiseasesNeoplasms, Complex and MixedLymph Node ExcisionComposite LymphomaOctamer Transcription Factor-3EndoscopesEsophagectomyRetrospective StudiesSOXB1 Transcription FactorsGiant Lymph Node HyperplasiaChoriocarcinomaEsophagusParaneoplastic Syndromes, Nervous SystemMesenchymomaChest TubesThoraxBronchial Neoplasms