Abstract
Records of 300 necropsies on pneumonia patients from the Medical Service of the U. S. Army base hospital at Fort Riley, Kan., are available for the purpose of this study. Among this number, pericarditis was found to have occurred in seventy-two, or 24 per cent. The types of pericarditis, as a complication in pneumonia encountered at necropsy, are shown in Table 1. In addition, hydropericardium, without apparent inflammatory change, had occurred in twelve instances, or 4 per cent. Empyema was present in sixty-three of the seventy-two instances of pericarditis, or 87.5 per cent. ACUTE SEROFIBRINOUS PERICARDITIS In approximately 5 per cent, of the pneumonia patients on whom necropsy was performed, acute serofibrinous pericarditis had occurred. Among the fourteen instances, lobar pneumonia had occurred in eleven, and bilateral bronchopneumonia had occurred in three. This form of pericarditis was characterized by the presence of a flaky pericardial fluid, which was cloudy in

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