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Interlobar empyema, or the occurrence of a collection of purulent fluid in the spaces between the lobes of the lungs, is a rare sequel of pneumonia, and has been given little or no consideration in most text-books. The ordinary form of empyema is more common and more readily recognized. Interlobar empyema may occur more commonly than is believed, since the disease may be unrecognized, and may terminate by rupture into a bronchus with discharge of the contents of the cavity and, later, by resolution, the condition then being considered to have been an abscess of the lung. Interlobar empyema is most likely to occur in the catarrhal pneumonias, which are located in or near the interlobar spaces, although it may occur in bronchopneumonia. It is due to the infection of the pleura which is present in every case of pneumonia to a greater or less degree.
Probably most practitioners are
SINKLER FW. INTERLOBAR EMPYEMA. JAMA. 1914;LXII(9):687–689. doi:10.1001/jama.1914.02560340029009
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