What are the characteristic features of pneumomediastinum (PM) seen on chest radiography?

Updated: Feb 26, 2019
  • Author: Patrick L Carolan, MD; Chief Editor: Girish D Sharma, MD, FCCP, FAAP  more...
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Answer

See the list below:

  • Ring around the artery (tubular artery): A radiolucent area is observed surrounding the right pulmonary artery when viewed on a lateral chest radiograph.

  • Thymic sail sign: In infants with pneumomediastinum, the thymic lobes are shifted upwards resembling a full sail.

  • Continuous diaphragm sign: Free air is present between the pericardium and diaphragm, causing the central parts of the diaphragm to become apparent.


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