Small nodules in the lungs are usually benign, but if there are malignant signs, such as burr, lobulation and vacuolar signs, they should be taken seriously. Small nodules in the lungs refer to focal rounded high-density shadows with a diameter of less than 1 cm, which are mostly benign and may be caused by lung infections, pulmonary tuberculosis, old lesions, and tuberculosis, and need to be reviewed regularly to observe the changes of the nodules. If the nodule is found to be increasing in size, then the possibility of malignancy should be considered and surgical resection should be carried out in a timely manner. Malignant nodules chest ct may have features such as vacuolar sign, bronchographic sign, cavities, burrs, etc., which may be early cancer or precancerous lesions. Finding small nodules in the lungs, patients are advised to seek timely medical treatment and listen to the advice of specialized doctors.