What is the Hamman sign in pneumomediastinum (PM)?

Updated: Feb 26, 2019
  • Author: Patrick L Carolan, MD; Chief Editor: Girish D Sharma, MD, FCCP, FAAP  more...
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This sign, which some authors have suggested is pathognomic of pneumomediastinum, consists of precordial systolic crepitations and diminution of heart sounds. Sahni et al (2013) in their meta-analysis estimate that this sign is detected in only 20% of patients with SPM. [24]

Damore reported a prevalence of 10% in his series. [13]

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