PMC4899678_01
33-year-old woman with spontaneous pneumomediastinum. Chest X-ray done during labor, before emergency cesarean section, showing subcutaneous emphysema in the neck (arrows).
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An initial mobile chest x-ray (CXR) (Fig. 1A) identified bilateral subcutaneous emphysema of the neck with no evidence of pneumothorax or pneumomediastinum.
33-year-old woman with spontaneous pneumomediastinum. Chest X-ray day 1 after Cesarean section showing more obvious signs of lucency (arrows)  outlining  the  aortic  arch  and  descending  aorta,  consistent  with  known  pneumomediastinum.
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A postdelivery double-contrast CT of the neck and chest (Figure 2A, Figure 2B, Figure 2C, Figure 2D) on day 1 detected a pneumomediastinum with tracking of subcutaneous emphysema extending from her face to the anterior and posterior thoracic walls bilaterally.