What should I do if I find a lung nodule? A lung nodule is simply a growth in the lung, but this can be benign or malignant! How can we tell? Lung nodules of different densities have different probabilities of malignancy. Lung nodules are classified into three categories based on nodule density: solid nodules, partially solid nodules (or mixed solid nodules), and ground glass density nodules. For how to determine the benignity and malignancy of pulmonary nodules, we go through these aspects: (a) Look at the clinical assessment of the risk of malignancy of the nodules The clinical assessment mainly contains the patient’s medical history, physical examination, occupation, smoking history, history of chronic lung disease, personal and family tumor history, and so on. This information is available as a reference for the differential diagnosis of pulmonary nodules. People who are over 40 years old, work under high pressure and have a history of long-term smoking, have had chronic lung diseases such as tuberculosis, emphysema, personal or family history of malignant tumors, and work in a heavily polluted environment for a long time and are exposed to a lot of oil fumes may be a high-risk group for lung cancer! (2) Imaging observation Chest X-ray, CT and MRI can detect the formation of lung nodules, among which chest CT is the standard test to detect lung nodules. Chest X-ray is not able to detect early lung cancer quickly. For indeterminate nodules in the chest, multiple follow-ups are usually required, and routine CT is recommended to prevent missed diagnosis.