Abstract: Objective To study on clinical diagnosis and treatment of lung cancer complicated by tuberculosis and the relationship of two diseases. Method A total of 54 patients with lung cancer complicated by tuberculosis were analysed retrospectively. Results All the patients’ histopathology types were squarmous cell carcinoma(18), adenoarcinoma(23), adenosquamous carcinoma(3),SCLC(2), unclassified carcinoma(7). Disease stage wasⅠa(2),Ⅰb(1),Ⅱb(6),Ⅲa(10),Ⅲb(10),Ⅳ(21).The type of tuberculosis wasⅠ(1), Ⅲ(43).Seven patients were missed diagnosed carcinoma. Four patients were missed diagnosed tuberculosis. The coexistence of two diseases in the same lobe was 78.1%.Conclusion Lung cancer complicated by tuberculosis is missed diagnosis or misdiagnosis easily. Doctors should pay more attention to it. Its prognosis is very bad . If the two diseases could be treated at the same time, the patients would survival longer. Carcinoma lesion and tuberculosis lesion have tight relationship.

Key words: Lung cancer, Pulmonary tuberculesis/complication