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Lateral chest radiograph of a 15-year-old boy who experienced acute pleurisy following a severe bout of vomiting.

124. the “ring around the artery” sign

Air surrounding the right pulmonary artery (arrows, image below) has been documented in only a few cases and is diagnostic ofpneumomediastinum. It is best seen on the lateral projection and may be the only radiographic evidence of pneumomediastinum.

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Source:  OpenStax, Images of memorable cases: 50 years at the bedside. OpenStax CNX. Dec 08, 2008 Download for free at http://cnx.org/content/col10449/1.7
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