Abstract: Objective To study misdiagnosed causes of primary TB to pneumonia.Method To analyze the clinical features,the films of chest X-ray,the reaction of tuberculin test in 33 cases,and find the differences between pneumonia and primary TB. Results General tuberculous intoxication symptoms such as subfebrile temperature, sweating ,indigestion, emaciation occurred in the cases. There were no high fever,shaking chills,tachypnea and three depression sign of pneumonia. Chest X-ray showed consolidation in lobar and segmental distribution. But see though the consolidation to get at the X-ray sign of primary TB in 21 cases. The positive result of tuberculin test supported the diagnosis of TB. Conclusion The misdiagnosis was happened, because the different clinical features were as neglected, the signs of chest-ray on primary TB was neglected, the tuberculin testing was not performed.

Key words: Children, Pulmonary tuberculosis, Misdiagnosis, Pneumonia