Whether a solid malignant pulmonary nodule is more malignant or not requires a combination of the size and nature of the nodule. Malignant lung nodules include ground glass nodules, partially solid nodules, and solid nodules. Partially solid nodules are the most malignant, followed by ground glass nodules and solid pulmonary nodules. Once a malignant pulmonary nodule is detected, the degree of malignancy needs to be analyzed based on the size of the nodule. If the nodule is larger than 8 mm, with changes such as lobarization, short burrs, pleural traction sign, and pleural depression sign, further enhanced CT chest examination needs to be given. If necessary, percutaneous lung aspiration cytohistological biopsy is given to find out whether early lung cancer occurs. Once early lung cancer is diagnosed, early surgical resection of the lesion by a thoracic surgeon is required. Solid malignant nodules are less malignant than some of the solid nodules, but they still need to be followed up dynamically with enhanced CT of the chest and treated with early surgical resection once detected.