Synonyms : Cyst, Mediastinal, Cyst, Pericardial, Cyst, Thoracic, Cyst, Thymic, Cyst, Tracheal, Cysts, Mediastinal, Cysts, Pericardial, Cysts, Thoracic, Cysts, Thymic, Cysts, Tracheal, Mediastinal Cysts, Pericardial Cysts, Thoracic Cysts, Thymic Cysts, Tracheal Cysts