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Pneumomediastinum, pneumopericardium and subcutaneous emphysema (SE)1 occur when gas is inappropriately present in anatomical structures. SE is due to the rupture of an alveolus or bronchiole under increased pressure allowing gas to escape extrapleurally. Spontaneous SE (SSE) is associated with acute asthma, aspiration pneumonia and hyaline membrane disease. SSE is uncommon with an incidence of around 1 in 20 000 …
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