The density of the ground-glass nodule becomes solid and high, indicating an increase in the solid component of the nodule, and the possibility of early invasive lung cancer needs to be considered. When reviewing chest CT, it is necessary to pay attention to the development of lung nodules from simple ground-glass nodules to solid nodules with increased density, or the appearance of new solid components in the ground-glass nodules, which may indicate the possibility of early invasive lung cancer. The presence of a new solid component may be a sign of nodal growth and malignancy, and therefore requires closer follow-up. When malignant nodules are suspected, it is recommended to improve tumor marker tests, and percutaneous lung aspiration biopsy can also be performed to clarify the nature of the nodule and further determine whether surgical resection of the nodule is needed.