Complete atelectasis of the right lung

This image shows complete atelectasis of the right lung due to a tuberculous stricture in the right main stem bronchus. Complete opacification of the right hemithorax is shown with marked cardiomediastinal shift to the right side. As a result, the cardiac silhouette is obscured by the collapsed lung. The left lung is hyperexpanded and shifts anteriorly across the midline into the right hemithorax. The aortic arch imprint is clearly visible in the lower trachea (arrow) and should not be mistaken for tracheal stenosis.