PURPOSE: To evaluate the CT findings of pulmonary tuberculosis in patients with diabetes mellitus (MD),according to the diabetic control state. MATERIALS AND METHODS: We retrospectively studied 34 cases of pulmonarytuberculosis accompanied by DM. We divided the right lung three lobes and ten segments and the left into two lobesand eight segments and analyzed CT findings of bronchogenic spread, cavitary lesion, ill-defined nodule, lobularconsolidation, lobar and segmental consolidation, atelectasis, interlobular septal thickening, fibrotic band, andassociated findings such as lymph node enlargement, pleural effusion and empyema. We also tried to determine thetypical CT findings of pulmonary tuberculosis according to diabetic duration and controlled state of DM focusingby FBS 160 and HbA1C 8.0. RESULT: Among 34 CT scans, bronchogenic spread was seen on 29 (85.3%), cavitary lesionon 26 (76.5%), ill-defined nodules on 11 (32.4%), lobular consolidation on 14 (41.2%), lobar and segmentalconsolidation on 12 (35.3%), atelectasis on four (14.7%), and fibrotic band on eight (23.5%). Multiple cavitieswere present in 76.9% of total cavitary lesions, and consolidation with bronchogenic spread in 75%; associatedfindings were as follows: lymph node enlargement (n=1), pleural effusion (n=10), empyema (n=2), and pericardialeffusion (n=2). In 46.7% of cases, general tubercular lesions were in an unusual location, but among cases ofsecondary pulmonary tuberculosis, 73.9% of lesions were in the usual location. More lobular consolidation was seenin patients with less than FBS 160 on admission, and this result was statistically significant (p<0.05); CTfindings did not, however, differ according to diabetic duration and HbA1C. CONCLUSION: In patients with DM,general fubercular lesions were found infrequently, but in secondary tubereulosis, multiple cavitary lesions-inthe usual location-were very frequent. In patients with DM, CT findings of pulmonary tuberculosis did not varyaccording to the diabetic control state, except that in patients with less than FBS 160 on admission, there was agreater degree of lobular consolidation.