Bilateral lung micronodule Lung_RADS2 grade means bilateral lung micronodule diameter less than 5mm, in the lung imaging report and data system (2014 American College of Radiology) standardized lung cancer screening for benign nodules, need to continue annual low-dose chest CT screening within 12 months. 1. Bilateral lung micronodule Lung_RADS2 grade benign for imaging diagnosis, the probability of malignancy is less than 1%, but non-pathological diagnosis, the patient is a high-risk group of lung cancer risk, the future does not exclude the possibility of malignant changes continue to grow, the need for regular review of chest CT, to achieve early detection, diagnosis and treatment. 2. Lung_RADS2 grade is commonly found in patients with chronic obstructive pulmonary disease (COPD), asthma, tuberculosis and heavy smoking, etc. These underlying causes need to be well prevented and treated, or else it will lead to the decline of lung function, which will affect the life expectancy of the patients. Lung_RADS2 grade micronodules in both lungs are recommended for regular hospital outpatient follow-up.