“For malignant lung nodules, read malignant lung nodules in early stage or benign to malignant. Malignant lung nodules are usually malignant in early stage, while benign lung nodules usually do not become malignant. As lung nodules are usually not easy to identify whether they are benign or malignant in the early stage, they need to be followed up dynamically by chest CT under the doctor’s guidance. Lung nodules smaller than 5mm are usually benign, usually belong to chronic inflammatory changes, and the patients do not have any clinical manifestations, they usually do not need special treatment, and they only need to be followed up dynamically by chest high-resolution CT. If the lung nodule is larger than 6~8mm, accompanied by short burr, lobular, pleural pull sign, pleural depression sign and other changes, we need to be alert to the possibility of malignancy, then we need to carry out chest enhancement CT examination, if necessary, should be performed percutaneous lung aspiration cytohistological biopsy, in order to clarify the diagnosis. Therefore, malignant lung nodules are usually malignant at an early stage, and benign lung nodules usually do not become malignant. Patients with lung nodules should follow the doctor’s instructions for review, in order to avoid missed diagnosis and misdiagnosis.