The Macklin effect--pneumomediastinum and pneumopericardium following blunt chest trauma.

Pneumomediastinum and pneumopericardium following blunt chest trauma are rare. Diagnosis is by chest radiograph and CT Scan. They have to be identified and treated accordingly. Usually, pneumomediastinum and pneumopericardium are self-limiting requiring no specific therapy. However, vigilance and a continuous monitoring of the vital signs are necessary.