Computed tomography of tracheal diverticulum

Tracheal diverticulum at the level of the thoracic inlet. Axial computed tomographic (CT) scan (A) shows a pocket of gas projecting posteriorly and to the right of the tracheal lumen (arrow). Sagittal CT (B) in the same patient demonstrates the diverticulum posterior to the tracheal lumen (dashed arrow).