Whether the mass shadow in the lower lobe of the right lung is serious or not should be judged according to the specific lesion. Pneumonia, tuberculosis, benign lung tumor, lung cancer, etc. can be manifested as mass shadow on imaging, the first three are not serious, and the fourth one is serious. 1. Pneumonia: Pneumonia infected with pathogens may be manifested as a mass shadow in the lower lobe of the right lung on CT, and the mass shadow will disappear after antibiotic treatment, and the pneumonia will get better. It is usually not serious. 2. Tuberculosis: Mycobacterium tuberculosis invades lung tissues and may form a mass in the lower lobe of the right lung, accompanied by symptoms such as low-grade fever and night sweating (sweating abnormally after going to sleep, but sweating stops after waking up), coughing and coughing up sputum, etc. The mass will become smaller and disappear after anti-tuberculosis treatment, which is not serious. 3. Benign lung tumors: the mass shadow may also be caused by benign tumors, the edge is generally smooth, uniform density. This kind of tumor is usually not serious. 4. Lung cancer: Lung cancer can be manifested as mass shadow in the lower lobe of the right lung, which is often accompanied by signs such as burr sign, lobation sign or pleural depression sign, etc. If metastasis occurs, lymph node enlargement and metastasis to distant organs will also occur, and tumor resection and postoperative chemotherapy will be needed. Relative to the above, severe. The mass shadow in the lower lobe of the right lung should firstly exclude the possibility of tumor by means of enhanced CT, pathological puncture, etc., clarify the cause of the disease according to the specific circumstances and relevant examinations, and carry out treatment.