Frosted glass micronodule is a special type of nodule, which is called micronodule within 0.5 cm in diameter. Frosted glass micronodules are thin hyperdense shadows that are poorly defined or well defined with limited features on CT imaging, which can reveal the lobular septa, vascular bundles, and airways traveling within them. Ground-glass micronodules are based on the distribution of tissue debris, cells, and fluid in part of the alveolar cavity or thickening of the alveolar septa, and may be closely associated with malignancy, infection, interstitial fibrosis, and edema. Pulmonary ground-glass nodules have a high rate of malignancy, so it is necessary to effectively differentiate their benign and malignant nature early in the course of the disease. Malignant ground-glass micronodules are characterized by burr sign, vacuolar sign, rapid growth, and abundant blood flow. Therefore, patients with ground glass micronodules should go to the hospital in time to improve the examination and clarify the nature of the tumor.