The mechanism responsible for<unk>  is the ‘Macklin effect’ – There is initially an increased pressure gradient between the alveoli and the interstitial space. Increased pressure leads to alveolar rupture, resulting in air getting through to the pericapillary interstitial pulmonary space. This space is continuous with the peribronchial and pulmonary perivascular sheaths. From here, the air tracks to the hilum of the lung and then to the mediastinum. In case of a pericardial tear, this air enters the pericardial cavity and<unk>  develops. The condition may remain asymptomatic or may progress to life-threatening conditions like tension<unk>  or cardiac tamponade.
Pneumopericardium
Hemopericardium
Urinothorax
Chylothorax
Fibrothorax
Hemothorax
Pneumomediastinum
Pneumothorax