Chang sign (pulmonary embolism)

Dr Daniel J Bell and Dr Henry Knipe et al.

The Chang sign refers to the dilatation and abrupt change in caliber of the main pulmonary artery due to pulmonary embolism 1. It is one of several described signs of pulmonary embolus on chest radiographs.

History and etymology

It is named after C H Joseph Chang, (July 7 1929 - November 15 2017) an American radiologist, who first described it in 1965 2.

See also


Article information

rID: 29902
System: Chest
Section: Signs
Synonyms or Alternate Spellings:
  • Chang sign
  • Changs sign
  • Chang sign in pulmonary embolism

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