-     result from abnormal budding of ventral foregut

Clinical Findings
          -     first 4 decades of life (84%)

          -     asymptomatic (40%)

          -     chest pain, dyspnea, respiratory infection,  

          wheezing, cough, dysphagia and pneumothorax

        Location

          Mediastinal (85%)

          -     middle (79%), posterior (17%), anterior (3%)

          -     subcarina (52%), paratrachea (19%),

         esophageal wall (14%), retrocardiac area (9%)

          Extramediastinal (15%)

          -     lung parenchyma, diaphragm, pleura

Imaging Findings

          -     sharply marginated

          -     round, oval or lobulated contour

          -     homogeneous

          -     water attenuation or soft tissue attenuation

          -     non-enhancement (77%)

                 mural enhancement (23%)

          -     calcification (10%) : cyst wall or cystic content

Treatment

    Removal

          -     symptomatic cyst

          -     asymptomatic cyst in young adult

    Wait and see

          -     asymptomatic adult

          -     high risk patient

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