The term bronchopulmonary suppuration is a broad one and is purposely employed to indicate suppuration within the bronchi and pulmonary parenchyma. There are three chief varieties of this general lesion: (1) the suppuration which follows the breaking down of an ordinary pneumonic process; (2) suppurative metastatic lesions during the course of a general infection, and (3) suppuration which originates within the bronchial tree (a) as a surface infection of the bronchial mucosa, (b) as retention suppuration due to obstruction by a foreign body, a tumor or a stricture or (c) as combinations of retention and infection. Cases of tuberculosis or actinomycosis are not included.
During the past five years, eighty-eight patients with empyema were treated in the service at Mount Sinai Hospital. Approximately 25 per cent of these cases were complicated by some form of bronchopulmonary suppuration. In practically all, the clinical course seemed to indicate that the empyema was