CTICasesPneumomediastinum with pseudo-pneumoperitoneum and extrapleural air
Imaging findings
Radiographs and CT show pneumomediastinum with air tracking along the diaphragmatic contour (simulating pneumoperitoneum) and over the lung apices (simulating pneumothorax), secondary to alveolar rupture and pulmonary interstitial emphysema.
Key takeaways
Pneumomediastinum can track along the extrapleural spaces, simulating pneumoperitoneum or pneumothorax on plain radiographs. Recognizing extrapleural tracking on CT prevents unnecessary chest tube placement or laparotomy.
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