PMC2957592_01
(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).
JA2009-496890.001.jpg
PMC2957592_01_JA2009-496890.001.jpg
fig1
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.
PMC2957592_02