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A review was made of the records of all patients with pulmonary tuberculosis and diabetes mellitus admitted over a 5- year period to a teaching hospital in Karachi, Pakistan. Among 42358 the total number with both tuberculosis and diabetes was 173. The prevalence of tuberculosis patients, in diabetic patients was 10- times higher than in non- diabetic patients and prevalence increased with duration of diabetes. The lower lung field was most frequently involved, followed by the upper and middle. Bilateral involvement was seen in half and an associated pleural effusion in one- third of the patients. Cavitating lesions were seen in 32% of men and 15% of women