Clinical Presentation

An 8-year-old boy with chest pain and difficulty swallowing.

Further Work-up

(A,B) Frontal chest radiograph demonstrates right paratracheal opacity. The left lung is hyperlucent. Lateral chest radiograph demonstrates a large mass posterior to the trachea (arrow), associated with tracheal narrowing. (C) Esophagogram demonstrates that the esophagus is displaced to the right by an extramural mass (arrow). (D) Axial post-contrast computed tomography (CT) image shows a large, low-density mass at the level of the carina. It narrows the left main bronchus (arrow). The right lung is now hyper-expanded.

Differential Diagnosis

• Bronchogenic cyst: