Nodule size is indicated by the maximum diameter of the plane with the largest nodule diameter, and the nodule height is determined by the number of tomographic sheets and the thickness of each sheet, which together can determine the three-dimensional size of the nodule. Appropriate treatment is selected by nodule size. The size of the ground glass nodule is mainly calculated diameter, the nodule has the largest diameter and the smallest diameter, the larger ground glass nodule can be seen in the chest X-ray, measuring the size of the ground glass nodule for the largest diameter, the smaller ground glass nodule is generally not visible in the chest X-ray, usually found during chest CT examination. Frosted glass nodules are focal, nodular or pale hyperdense shadows in the lungs that look like frosted glass, hence the name. Frosted glass nodules can be categorized into simple frosted glass nodules and mixed frosted glass nodules. The former refers to nodules of uniform density without solid components, while the latter refers to nodules with solid components. Pure ground-glass nodules with a diameter of <5mm need no special treatment and regular follow-up observation, while those with a diameter of >8mm need surgical treatment, and those with a diameter of 6-8mm need to be judged according to the proportion of solid components, the location of the nodule, and the patient’s physical condition. Ground glass nodules with a minimum diameter of >10mm should be actively treated. In mixed ground-glass nodules, the size of the solid component of the nodule is clinically instructive, and an increase in the size of the solid component is also indicative of cancer. If the solid component is <5-6 mm in diameter, CT should be repeated in 3-6 months; if the solid component is 6-8 mm in diameter, CT should be repeated in a shorter period of time; and if it is >8 mm in diameter, PET/CT as well as biopsy should be performed. Prompt medical attention is recommended if ground glass nodules are found.