Ground-glass shadows in the lungs that have not changed for 3 years usually do not require treatment, but continued follow-up is still recommended. According to the different densities of lung nodules, they are divided into three categories: partially solid nodules, ground glass density nodules and solid nodules, among which ground glass density nodules are at intermediate risk of cancer, and according to the “Diagnostic and Therapeutic Guidelines for the Classification of Lung Nodules”, the risk of nodules bounded by a diameter of 5 mm is also different. 1. Pure ground-glass density nodules with a diameter of >5 mm are usually intermediate to high-risk nodules, and it is recommended that CT be repeated at 3, 6, 12, and 24 months; if the nodule grows during the follow-up period, then surgery is recommended; if there is no change in the size of the nodule in repeated CT examinations or the nodule shrinks, then it is recommended that the nodule continue to be followed up by CT for a long period of time. 2. Pure ground-glass nodules with a diameter of <5 mm are usually considered low-risk nodules, but it is still recommended to review CT every year to observe the growth of the nodule and changes in the shadow density, and to further manage the nodule according to the changes in the nodule. If there is a possibility that the ground-glass nodules in the lungs may change at any time, it is recommended that they be followed up routinely in regular hospitals, regardless of their size, and if there is any change in their size or density, they need to be further diagnosed and treated.