The diagnosis of tuberculosis cannot be confirmed by CT examination alone. The diagnosis of tuberculosis generally includes epidemiologic history, clinical manifestations, imaging tests, and laboratory tests. 1. Epidemiologic history: confirm whether the patient has a history of exposure to tuberculosis. 2. Clinical manifestations: including pulmonary symptoms and systemic symptoms, pulmonary symptoms mainly include cough, sputum and hemoptysis, etc., and systemic symptoms mainly include afternoon low-grade fever, night sweats (sweating abnormally after going to sleep, but sweating stops after waking up), and malaise. 3. Imaging examination: including chest CT examination and chest radiograph, which are mainly used to clarify whether there are typical tuberculosis-like lesions in the lungs. It may also show images of caseous pneumonia, pulmonary cavities, and exudative lesions. 4. Laboratory tests: These include Mycobacterium tuberculosis test and sputum culture. If the test result is positive, the diagnosis of tuberculosis can be confirmed. If the test result is negative or there are solid lesions, it is necessary to obtain specimens for pathologic testing through bronchoscopy, and the result suggests that tuberculosis can be finally diagnosed. TB patients should be isolated to avoid spreading the disease to others.