Some of the sclerotic nodules in secondary tuberculosis may be localized with calcification and fibrous foci formation. Tuberculosis is a chronic infectious disease due to Mycobacterium tuberculosis that can be transmitted through the respiratory tract. Secondary TB is prevalent in adults, and imaging suggests that some of the hard nodules have formed, possibly due to localized calcification and fibrosis as a result of the long duration of TB. In patients with TB, a full course and amount of anti-tuberculosis treatment is needed. In patients with secondary tuberculosis who have been treated, the presence of hard nodules may be due to the formation of calcified foci, and if the tuberculosis foci are basically completely calcified, it indicates that the tuberculosis may have been cured. If you find some hard nodules in secondary tuberculosis, it is recommended to go to the hospital for examination and treatment in time.