- Etiology: barotrauma causing rupture of alveoli into interstitium, blunt thoracic trauma causing bronchus rupture, esophageal tear
- Imaging: outlines and lifts thymus leading to spinnaker sail sign of mediastinal air between thymus + heart, continuous diaphragm sign, can dissect into neck / peritoneum / retroperitoneum, tracheobronchial injury can also have pneumothorax
- Complications: can decrease venous return if in posterior mediastinum
Radiology Cases of Pneumomediastinum






