Chang sign (pulmonary embolism)

Last revised by Calum Worsley on 28 Jan 2022

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, (7 July 1929 - 15 November 2017) an American radiologist, who first described it in 1965 2.

See also

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