The surgical standard for lung nodules is 8mm. If the nodule is 5mm or less, it is called micro-nodule, which is ground glass-like and is mostly considered malignant when it contains solid components, but no surgery is needed for the time being and observation can be continued because the nodule is still small and will not affect the body. If the nodule is purely glassy, even if it is 8 mm long, surgery is not necessary because the purely glassy pathological type is not necessarily cancerous, but is more likely to be an atypical adenoma-like hyperplasia. When the nodule has a parenchymal component, it is often an adenocarcinoma in situ, and when it breaks through the alveolar membrane, it is called microinvasive adenocarcinoma, which requires surgery.