Patient: Description of the condition (onset time, main symptoms, hospital visited, etc.): The lung was found to have a soybean size nodule at the bottom of the left lung lobe during physical examination Qilu Petrochemical Center Hospital, Linzi District, Zibo City, Shandong Province, China Half a month of anti-inflammatory injections did not see any change Determine the disease Jinan Central Hospital Thoracic Surgery Department Li Xiaohua: should belong to the category of microscopic lung lesions, differential diagnosis is often difficult, you should bring a CT film to ask professional physician for face-to-face diagnosis. The general principles of treatment are: 1. Dynamic observation of size changes within 3 months. If there is a significant tendency to increase, surgery is recommended to remove it. 2.If it is peripheral, a biopsy can be taken by lumpectomy. 3.PET/CT examination can also be performed for characterization.