Lung nodule 2CM is more likely to be a malignant tumor, but it may also be a benign nodule, which needs to be judged by combining the patient’s clinical features, chest CT imaging features and pathological biopsy. 1. Clinical features: if the patient has high risk factors for lung cancer (age over 40, smoking, history of lung cancer or other malignant tumors or family history, history of occupational exposure, etc.) or has cough, blood in sputum, chest pain, recent weight loss and other manifestations, then the possibility of lung nodule of 2CM being a malignant tumor is very high. 2. Chest CT examination of malignant nodule signs: peripheral burr of lung nodule, lobing, pleural pulling, vascular signs, small vacuoles, air-containing fine bronchial signs, eccentric thick-walled cavities, etc., then it is a high-risk nodule for lung cancer, and the possibility of malignant tumors is very high. 3. Pathological biopsy: percutaneous lung puncture or fiberoptic bronchoscopy biopsy can be used for pathological diagnosis of nodules. If the lung nodule 2CM is a malignant tumor, there is still a chance of radical surgery, and it is necessary to take active treatment measures, otherwise the disease will progress quickly and cause delay.