CTICasesSpontaneous Pneumomediastinum
Imaging findings
Chest radiograph and CT show gas dissecting along the mediastinum, demonstrating the 'ring-around-the-artery' sign where gas outlines the main pulmonary artery and the aortic arch. Gas is also noted dissecting into the supraclavicular fossae.
Key takeaways
Spontaneous pneumomediastinum (often due to alveolar rupture and the Macklin effect) can be subtle on frontal radiographs. The 'ring-around-the-artery' sign on radiographs and the presence of supraclavicular subcutaneous air are key clues, and lateral radiographs are often essential for detection.
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