During the winter and spring of 1944–45, the authors saw approximately 3,500 cases of pneumonia at a naval hospital. In this group there were 7 cases of a rather bizarre type of bronchopneumonia characterized by parenchymal suppuration and necrosis with cavity formation. Because this entity is not particularly well known and the pertinent radiologic literature is sparse, these cases will be reported in some detail. Although several fragmentary references had been made to the pathology of this disease in the continental literature (1, 2, 4, 6, 10, 11, 21, 28), no adequate description of the clinical and roentgen findings was recorded prior to Kessel's report, in 1930 (9). That investigator noted the clinical and roentgen aspects of 5 cases in detail and appended a gross and microscopic description of 3 additional cases which came to necropsy. In general, credit for a proper understanding of this disease must go to the Mt. Sinai Thoracic Group, whose investigations have led to a clear concept of the pathoge...