case_images: PMC2957592_01
case_images: (a) Posteroanterior
  chest radiograph that shows the mediastinal reflections of the pleura separated from the pericardium by a lucent band of air representing pneumomediastinum (arrows). (b) Lateral chest radiograph that shows the outer border of the ascending and descending thoracic aorta, which are underlined by mediastinal free air collection (arrows).
case_images: JA2009-496890.001.jpg
case_images: PMC2957592_01_JA2009-496890.001.jpg
case_images: fig1
case_images: The patient was referred for posteroanterior and lateral chest X-ray (Figures 1(a) and 1(b)), which demonstrated linear streaks of air in the mediastinum extending into the upper parts of the lung, more evident in the lateral projection.
case_images: PMC2957592_02