Whether the lung ground-glass nodule is malignant or not depends on the size and nature of the nodule, the main analysis is as follows: 1, do not consider malignant: ground-glass nodule is less than 5mm, or even less than 3mm, most often seen in benign nodules, it is recommended to follow up once a year high-resolution CT of the chest, and if there is no change in the nodule, most of the nodules are benign. If the ground glass nodule is between 6-8mm, it is recommended to review once every three months, and if there is no change in the nodule, malignant transformation is still not considered.2. Alert to malignant transformation: If the nodule is accompanied by short burr, lobulation sign, pleural depression sign, pleural pulling sign, and the nodule changes in the form of growth, it is necessary to be highly alert to the possibility of malignant transformation. Therefore, the chance of malignant transformation of ground-glass nodule mainly depends on whether the ground-glass nodule is a growing nodule, whether the size is larger than 8mm, and whether it is accompanied by pleural depression, pleural pulling, short burr, and lobar sign.