MediastinumMediastinal NeoplasmsMediastinal DiseasesMediastinal CystTomography, X-Ray ComputedMediastinoscopyThoracotomyRadiography, ThoracicMediastinitisGoiter, SubsternalThymus NeoplasmsThoracic Surgery, Video-AssistedThoracic Surgical ProceduresPleural CavityThymomaThoracoscopyBronchogenic Cyst3-IodobenzylguanidineThoracic NeoplasmsPneumomediastinum, DiagnosticDelayed DiagnosisSensitivity and SpecificityLymphangioma, CysticChoristomaPrenatal DiagnosisEarly DiagnosisSternumRetrospective StudiesSuperior Vena Cava SyndromeFatal OutcomeIncidental FindingsTreatment OutcomeVisible Human ProjectsEsophageal CystBiopsyMediastinoscopesEsophageal PerforationGanglioneuromaBiopsy, NeedleNeurilemmomaDiagnostic ErrorsMagnetic Resonance ImagingGastroscopesEndosonographyDiagnosisParathyroid NeoplasmsPlasma Cell Granuloma, PulmonaryLung NeoplasmsRadiopharmaceuticalsBronchoscopyLiposarcomaRetroperitoneal NeoplasmsMediastinal EmphysemaLymphangiomaChylothoraxThymus HyperplasiaRadionuclide ImagingSeminomaPleuraBiopsy, Fine-NeedleHematemesisFollow-Up StudiesThoracic DiseasesGallium RadioisotopesPredictive Value of TestsThoracostomyThymectomyPleural EffusionEsophagusEsophageal DiseasesSpermatocelePrognosisNeoplasms, Complex and MixedEndoscopesProspective StudiesBronchial NeoplasmsThoraxDrainageNeckGiant Lymph Node HyperplasiaEsophagectomyMesenchymomaTeratomaComposite LymphomaSclerosisNeoplasms, Germ Cell and EmbryonalPleural NeoplasmsTime FactorsReproducibility of ResultsChest TubesNeoplasm StagingRupture, SpontaneousHemothoraxBronchoscopesLymphatic DiseasesImmunohistochemistryPneumonectomyHistiocytoma, Benign FibrousEsophageal FistulaThoracoscopes