Ginecología y obstetricia de México
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Spontaneous pneumomediastinum is the presence of free air contained within the mediastinum, frequently associated with subcutaneous emphysema and of atraumatic origin. Frequency during childbirth is 1 in 100,000. ⋯ Simple X ray film and thoracic tomography revealed the presence of free air in the mediastinum. The association of pneumomediastinum during delivery is an uncommon event.