MediastinumMediastinal NeoplasmsMediastinal DiseasesMediastinal CystMediastinoscopyThoracotomyTomography, X-Ray ComputedRadiography, ThoracicMediastinitisGoiter, SubsternalThymus NeoplasmsThoracic Surgery, Video-AssistedThoracic Surgical ProceduresSuperior Vena Cava SyndromePleural CavityThymomaBronchogenic CystThoracoscopy3-IodobenzylguanidinePneumomediastinum, DiagnosticThoracic NeoplasmsLymphangioma, CysticChoristomaSternumEsophageal CystVisible Human ProjectsVena Cava, SuperiorIncidental FindingsMediastinoscopesEsophageal PerforationGanglioneuromaGastroscopesPlasma Cell Granuloma, PulmonaryParathyroid NeoplasmsTreatment OutcomeNeurilemmomaMediastinal EmphysemaFatal OutcomeThymus HyperplasiaLiposarcomaSeminomaRadiopharmaceuticalsRetroperitoneal NeoplasmsLymphangiomaChylothoraxEndosonographyThoracostomyPleuraSuperior ColliculiThymectomyLung NeoplasmsHematemesisRadionuclide ImagingGallium RadioisotopesSpermatoceleThoracic DiseasesMagnetic Resonance ImagingBronchoscopyNeoplasms, Complex and MixedComposite LymphomaEndoscopesEsophagectomyEsophagusBiopsy, NeedleChest TubesGiant Lymph Node HyperplasiaMesenchymomaThoraxBronchial NeoplasmsNeoplasms, Germ Cell and EmbryonalTeratomaEsophageal DiseasesHemothoraxSclerosisDrainageBiopsyPleural EffusionMesenteric Artery, SuperiorNeck