‖ ˌpneumoperiˈcardium Path.
[mod.L., f. pneumo- + pericardium.]
The presence of air or gas in the pericardium. So ‖ ˌpneumopericarˈditis, pneumopericardium accompanied by pericarditis (Billings Med. Dict. 1890).
| 1854 Jones & Siev. Pathol. Anat. xvii. 297 A condition of the heart rarely found until after death, and termed by Laennec pneumo-pericardium, consists in an effusion of air into the sac. 1898 Allbutt's Syst. Med. V. 801 Pneumo⁓pericardium is extremely rare. |