First, are all ground glass nodules in the lungs not good? The answer is no. Ground glass nodules can be either benign or malignant lesions. Benign lesions such as inflammation, hemorrhage and adenomatous hyperplasia can manifest in the form of ground glass nodules, while malignant lesions, mainly early stage lung cancer, also often exist in the form of ground glass nodules. Although there is a certain difference between benign and malignant lesions in CT performance, when the lesions are small (e.g., below 1 cm) the characteristics presented are not obvious, so it is often difficult to identify them in the first examination, and follow-up review is needed to observe the changes of the lesions in order to make a judgment. Is a purely ground glass nodule or a partially solid nodule better? The answer is purely ground glass nodules are better! First of all, inflammation and bleeding in the form of nodules are mostly purely ground glass density, and partially solid nodules are rare. Secondly, for lung cancer or precancerous lesions (adenomatous hyperplasia), the greater the proportion of ground glass, the greater the likelihood that the lesion is at an early stage; conversely, the greater the solid component, the greater the likelihood of malignancy and the more aggressive the lesion. However, a completely solid nodule is a different story, and it does not mean that a completely solid nodule is necessarily malignant! Many solid nodules are also benign lesions, especially the smaller solid nodules. Third, do all ground glass nodules require frequent follow up and review? The answer is no. It should be judged according to the size of the lesion and the amount of solid components as well as the magnitude of risk factors. glass nodules below 5mm almost do not need regular follow-up; pure glass nodules above 5mm will be reviewed for the first time in half a year to one year, if they have shrunk or disappeared, they will be judged as benign and do not need further follow-up, if there is no change, they will be reviewed once in 1 to 2 years; partially solid nodules above 5mm will be reviewed for the first time in 3-6 months, if there is absorption, they will be judged as benign. If there is absorption, the nodule is also considered benign, and if there is no change, it will be reviewed once every 6-12 months. If the lesion is found to be significantly larger or the solid component of the lesion is significantly increased during the follow-up, the probability of the lesion being malignant is greatly increased and should be surgically removed as soon as possible! Will the follow-up review delay the treatment of ground glass nodules? Is the more frequent the review, the better? The answer is no. First of all, as mentioned above, many of the ground glass nodules may be benign, so if they are removed without question, it is obvious that many people will receive a knife for nothing, which is over-treatment. Secondly, even if the glass nodules are difficult to determine the nature of lung cancer, most of them are early stage lung cancer or precancerous lesions, and their stabilization period is quite long, which can be 2-10 years without significant changes; according to the regular follow-up, even if the changes are found and then removed, the results are still very good, and almost 100% of them can survive for a long time. Therefore, the follow-up interval should be carried out according to the doctor’s requirements, and there is no need to review too frequently, which will lead to the patient receiving too much radiation in the short term, and such an anxious state of mind is harmful to the patient’s health rather than beneficial! If the nature of the lesion cannot be determined by the first CT examination, the patient should be followed up regularly according to the doctor’s orders, and should not be too careless to let it happen, nor should he be too worried and anxious to be reviewed frequently, but should maintain a good attitude and actively cooperate with the diagnosis and treatment.