Abstract
Pneumomediastinum refers to an abnormal presence of air in the mediastinum. It manifests as air outlining normal anatomic structures. When air collects around the mediastinal (extrapericardial) portion of the right pulmonary artery, air is seen as a lucency along or surrounding the artery on a lateral chest radiograph (1). This is the reported appearance of the ringaround-the-artery sign.
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