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Pneumopericardium after blunt chest trauma it's a very rare entity in adults, usually seen in association with pneumothorax or pneumomediastinum. When isolated, it's believed to be caused by the Macklin effect. Generally, it's a benign, self-limiting condition requiring no additional therapy. However, it must be recognized because an increase in intrapulmonary pressure (example- intubation) can lead to a tension pneumopericardium or cardiac tamponade.doi:10.18203/2349-2902.isj20220952 fatcat:7mzk24mxqjajxfumfq7l66tra4