Small pulmonary nodules are various isolated hyperplastic masses in the lung found in the imaging. Physicians at home and abroad attach great importance to this, and the 2007 U.S. edition of the Lung Cancer Guidelines even devoted a large section to the transformation of small pulmonary nodules into lung cancer, which is briefly described as follows imaging data. 2.For imaging showing isolated pulmonary nodules that have been stable for more than two years, if a recurrent glassy shadow is found, a re-evaluation must be made for further examination. 3.For small nodules below 8 mm with structural calcification, clear and isolated small pulmonary nodules, further examination is not advocated, but high-resolution CT is required every 2 years. 4, for small pulmonary nodules in the range of 8 to 10 mm, continuous CT follow-up scans should be performed, because the malignancy rate of these may be around 5%, and it is recommended that CT examinations should be performed at the 3rd, 6th, 12th, and 24th months, respectively, from the date of detection. 5. For patients with isolated pulmonary nodules (SPN) of variable nature with a diameter of at least 8-10 mm, when clinical evidence and imaging findings are conflicting, such as when the clinical inference of malignancy is high and PDG-PET results are negative or when a benign diagnosis requiring treatment is suspected, and when the patient expects a definitive diagnosis before surgery For peripheral lesions, it is recommended that transthoracic needle aspiration biopsy may be preferred unless puncture is contraindicated or the lesion site is not amenable to puncture. Bronchoscopy is feasible when air bronchial signs are present (2C). 6. For surgically resectable subcentimeter lung nodules without risk factors for lung cancer, the frequency and duration of follow-up (low-dose CT) depends on the size of the nodule: (1) lung nodules measuring less than 4 mm in diameter do not require follow-up, but patients should be fully informed of the risks and benefits of follow-up; (2) lung nodules measuring 4-6 mm in diameter are reevaluated at 12 months without long-term follow-up unless (3) Pulmonary nodules with a measured nodal diameter of 6 to 8 mm are followed up at 6 to 8 months and then again at 18 to 24 months unless the lesion increases in size (2C). 7. For surgically resectable subcentimeter lung nodules with one or more risk factors for lung cancer, the frequency and duration of follow-up (low-dose CT) depends on the size of the nodule: (1) lung nodules measuring less than 4 mm in diameter are reevaluated at 12 months without long-term follow-up unless the lesion is enlarged; (2) lung nodules measuring 4 to 6 mm in diameter are followed up at 6 to 8 months and then again at 18 ~(3) pulmonary nodules measuring 6-8 mm in diameter should be followed up at 3, 6, 9, 12, and 24 months unless the lesion is enlarged (2C). Small pulmonary nodules is a term unique to the medical community, and its mutation into lung cancer has become a major factor in the etiology of lung cancer, but many clinicians and patients do not pay much attention to it, resulting in cancer in some of them.