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...
  • Print

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.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!