CTICasesPneumomediastinum presenting with the ring-around-the-artery sign
Imaging findings
Chest radiograph and CT show a subtle pneumomediastinum characterized by air outlining the right pulmonary artery and superior pulmonary vein (ring-around-the-artery sign).
Key takeaways
The ring-around-the-artery sign is a useful radiographic marker of pneumomediastinum, caused by air tracking along the sheath of the right pulmonary artery. It is best seen on lateral chest radiographs.
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