CT scan showing severe lung contusions.  Caption reads, "CT scan, transversal view, showing pneumothorax, pneumomediastinum and pneumopericardium. Haematothorax is present at the time of scanning." Text of article reads, "CT scanning of the thorax, performed approximately 12 hours after admission, showed a pneumopericardium, as well as pneumomediastinum and bilateral pneumothorax (Figure 4). Severe lung contusion and haematothorax were also apparent on these images."
Konijn AJ, Egbers PH, Kuiper MA
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Konijn AJ, Egbers PH, Kuiper MA (2008). "Pneumopericardium should be considered with electrocardiogram changes after blunt chest trauma: A case report". Journal of Medical Case Reports 2: 100. doi:10.1186/1752-1947-2-100. <a class="external mw-magiclink-pmid" rel="nofollow" href="//www.ncbi.nlm.nih.gov/pubmed/18394149?dopt=Abstract">PMID 18394149</a>.  <a rel="nofollow" class="external free" href="http://www.jmedicalcasereports.com/content/2/1/100">http://www.jmedicalcasereports.com/content/2/1/100</a>