Based on the previous review and research, we would like to further observe the nodule changes in patients with pulmonary nodules. These changes include factors such as the reason for the further enlargement or deterioration of the nodule, time, lifestyle, the patient's region, and hereditary medical history. At the same time, we will further look at the corresponding characteristics of a population that does not change the size and nature of the nodule, including age, gender, and all the factors discussed above. On this basis, we can propose more scientific methods for the treatment and management of pulmonary nodules, and provide a more reliable clinical reference for the clinical treatment of pulmonary nodules.

Inclusion Criteria:

LNs patients aged 18 years and older who were previously treated in Guang'anmen hospital.

Exclusion Criteria:

(1) had the LNs removed; (2) LNs less than or equal to 3 mm in size; (3) had not undergone thorax CT; (4) had failed to complete treatment; (5) had incomplete medical records or was lost to follow-up.

LNs patients aged 18 years and older who were previously treated in Guang'anmen hospital.