References
1. Maunder RJ, Pierson DJ, Hudson LD. Subcutaneous and mediastinal
emphysema. Arch Intern Med. 1984;144:1447-1453.
2. Singla M, Potocko J, Sanstead J, Pepper P. Ooh-rah! An unusual cause
of spontaneous pneumomediastinum. Mil Med. 2012;177:1396-1398.
3. Sherrier D, Lizardo RE. Spontaneous pneumopericardium in a U.S.
marine: do not lose heart. Mil Med. 2020;185:e518-e521.