ABSTRACT
Purpose: To investigate the pathogenesis and clinical treatment of pulmonary inflammatory pseudotumor (PIP). Methods:To analyze the pathogenic characteristics and X-ray findings of 18 cases of PIP. Results:The rate of incidence in PIP is increasing in recent years .70 percent of the patients have infection of the respiratory system and is related to the abuse of large doses of antibiotics, there is little specificity in X-ray or CT so it is easy to confuse with malignant tumor of the lung .In pathologic sections of PIP, no malignant changes were seen, and only inflammatory cells, lymphocytes and plasm cells could be seen by light microscope. Conclusions:The antibiotic must be used properly in infection of the respiratory system and surgical treatment can be done in some asses to exclude tumor of the lung in diagnosis.