AVSTS
Pneumomediastinum is the accumulation of free gas within the mediastinum; this provides contrast and enhances the outer walls of mediastinal structures such as the trachea, oesophagus and great vessels. Pneumomediastinum is best observed on a lateral radiograph, as the width of the mediastinum is not significantly increased. The source of air may be the trachea, main stem bronchi, marginal ... ................
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