Haystack sign (pneumomediastinum)

Last revised by Dr Vincent Tatco on 25 Apr 2019

The haystack sign on chest radiographs in pediatric patients is indicative of pneumomediastinum. The pediatric heart is surrounded above and below with gas, giving it an appearance of a haystack from Monet's paintings. 

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Cases and figures

  • Figure 1: haystacks
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  • Case 1: pneumomediastinum
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