MediastinumTracheaMediastinal NeoplasmsMediastinal DiseasesMediastinal CystTomography, X-Ray ComputedThoracotomyMediastinoscopyTracheal NeoplasmsRadiography, ThoracicGoiter, SubsternalMediastinitisTracheal DiseasesVentricular Function, LeftThoracic Surgical ProceduresThymus NeoplasmsThoracic Surgery, Video-AssistedPleural CavityBronchogenic CystThymomaTracheal StenosisVentricular Dysfunction, LeftThoracoscopy3-IodobenzylguanidinePneumomediastinum, DiagnosticThoracic NeoplasmsLymphangioma, CysticChoristomaSternumBronchoscopyHypertrophy, Left VentricularSuperior Vena Cava SyndromeVisible Human ProjectsEsophageal CystIncidental FindingsTreatment OutcomeMediastinoscopesFatal OutcomeGuinea PigsBronchial NeoplasmsEsophageal PerforationGanglioneuromaGastroscopesMuscle, SmoothPlasma Cell Granuloma, PulmonaryMediastinal EmphysemaParathyroid NeoplasmsNeurilemmomaEsophagusAtrial Function, LeftRadiopharmaceuticalsLiposarcomaThymus HyperplasiaLungRetroperitoneal NeoplasmsSeminomaChylothoraxLymphangiomaLung NeoplasmsEchocardiographyPleuraEndosonographyThoracostomyThymectomyRadionuclide ImagingThoraxHematemesisBronchiDogsHeart VentriclesGallium RadioisotopesSpermatoceleMuscle RelaxationThoracic DiseasesHeartSubcutaneous EmphysemaNeoplasms, Complex and MixedRetrospective StudiesLarynxEndoscopesComposite LymphomaEsophagectomyBiopsy, NeedleBronchoscopesBiopsyMuscle ContractionHemothoraxGiant Lymph Node HyperplasiaChest TubesNeckMesenchymomaSclerosisTeratomaDrainageEsophageal DiseasesIntubation, IntratrachealNeoplasms, Germ Cell and EmbryonalTime FactorsPleural EffusionFollow-Up Studies