What should I do if I find a nodule in my lung that is 0.5 to 1 cm in diameter? Should I operate or wait? If surgery, how can I locate it accurately? First, I would like to present two cases: Case 1. A 0.6 cm diameter nodule in the left upper lung was found for 3 months, with gross glass changes (GGO), low density, and 1 cm from the lung surface, which was difficult to localize by palpation intraoperatively. The lesion was successfully found intraoperatively, and the intraoperative frozen pathology was atypical adenomatous hyperplasia, i.e. precancerous lesion, without lobectomy. The postoperative recovery was smooth and chemotherapy was not required. Case 2. The physical examination revealed 2 nodules of 0.5 cm in diameter for 2 months, with no significant change after anti-inflammation, and the CT report concluded that one of the nodules had irregular burrs at the edge, and the tumor could not be excluded. I used a preoperative request to the interventional department to locate the puncture needle under CT and left in the lung (the lesion was located 2 cm below the surface of the lung). Intraoperative thoracoscopic resection of the lesion along the puncture needle with an endoscopic cutting suture was performed, and the lesion was successfully found, and the intraoperative pathology was mechanized pneumonia. It is very difficult to characterize small nodules in the lung and one can wait for the lesion to change before operating. Some tumors grow very slowly and do not change for half a year or a year, and metastasis during this period is troublesome; the only clear diagnosis is to take pathology. The above methods can be said to be less invasive and have a high confirmation rate.