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The Ring-around-the-Artery Sign¹

¹ From the Department of Diagnostic Imaging, the Ottawa Hospital, Civic Campus, 1053 Carling Ave, Ottawa, ON, Canada K1Y 4E9. Received June 15, 2004; revision requested August 24; revision received September 26; accepted October 26. Address correspondence to the author (e-mail: prachipragya{at}yahoo.com).

View larger version (139K): [in this window] [in a new window] [Download PPT slide]   Lateral chest radiograph (close-up view of hilar area) in a 17-year-old boy with asthma with spontaneous pneumomediastinum shows a well-defined lucency (arrows) along the right pulmonary artery due to mediastinal air. This appearance is known as the ring-around-the-artery sign.