Inflammatory pseudotumor should be pneumonic pseudotumor, there are many differences between pneumonic pseudotumor and lung cancer, the common differences are nature, clinical symptoms, treatment and so on. 1. Nature: Pneumatoid pseudotumor is a kind of chronic inflammatory disease, mostly seen in eyes or lungs, which is a kind of benign occupying disease; Lung cancer is a kind of malignant occupying disease, which is a malignant tumor originated from the bronchial mucosa or glands in lungs. 2. Clinical symptoms: Pneumatoid pseudotumor, due to inflammation, will be manifested as fever, purulent sputum, coughing with yellow sputum, etc., anyone can develop the disease, and young people are more; lung cancer will be manifested as persistent dry cough, coughing, chest pain, etc., and the patients are mostly old people and long-term smokers. 3. Treatment: Pneumatoid pseudotumor is a benign lesion, which can be cured by surgical treatment; lung cancer is a malignant lesion, which is preferred to surgical treatment, and radiotherapy, immunotherapy, targeted therapy and so on are carried out after surgery. If patients have the above symptoms, it is recommended to go to the hospital in time.