Tracheoesophageal fistula

This image shows a tracheoesophageal fistula in patient with esophageal carcinoma who was treated with retrosternal colonic interposition.
(A) The axial computed tomography (CT) scan shows the fistula (arrow) and the gas-containing retrosternal colon, which is posterior to the trachea.
(B) Sagittal reformation shows the fistula (asterisk) and the gas-containing retrosternal colon.