In this case, it is difficult for most doctors to make a definitive conclusion about this microscopic lesion with the help of CT. For physicians, the only gold standard for lung cancer diagnosis is cytologic diagnosis. Many clinicians usually adopt a “2W (wait and watch)” attitude. However, this approach may not be a good thing for the patient. On the one hand, if the tumor develops quickly, it may grow into a large tumor within three months; by the time the nodule grows large enough to be more than 1.5 cm in diameter and there is sufficient imaging evidence of malignancy, the patient may have already lost the best time for treatment. On the other hand, this nodule is like a time bomb for the patient himself, which makes his mind particularly stressful. In any case, early diagnosis is the key to early lung cancer. Whether a small nodule is good or bad should be handled with cautious results, and with accurate localization, minimally invasive surgical resection can be chosen to get the final pathological results to guide further treatment. If small nodules in CT films are dominated by isolated nodules and ground glass-like changes, then it is likely to be lung cancer: in the case of ground glass-like nodules, for example, its presence may strongly indicate an early stage of malignant disease, especially if the lesion is expanding or if there is a solid substance that keeps getting larger. In this case, the malignancy rate of the lesion is about 90% or more. If a thoracic surgeon can detect an isolated nodule in the lung early and determine the goodness of the nodule, it is more likely that the early stage patient will have a chance to be cured.