when tuberculous pneumonia appears as a segmental or lober consolidation, its is difficult to differentiate tuberculous pneumonia from nontuberculous bacterial pneumonia radiologically. The object of this study was to define the typical radiographic findings of tuberculous pneumonia through comparative analysis of tuberculous and nontuberculous pneumonia. A review of chest radiographs in 29 patients with tuberculous pneumonia and in 23 patients with nontuberculous bacterial pneumonia was made with regard to homogeneity, volume loss, air-fluid level within the cavities, air-bronchogram, pleural disease, and predilection sites. The characteristic findings of tuberculous pneumonia are a heterogeneous density of infiltration(66%), evidence of volume loss of infiltrative lesion(52%), and cavity formation(48%)without air-fluid level. An associated parameter of analysis is the relative absence of leukocytosis(76%).