Milled glass nodules are a type of lung nodule, and a milled glass shadow is a dense, pale shadow that appears on chest imaging. Lung nodules are categorized into solid and sub-solid nodules according to their density, while sub-solid nodules contain pure ground glass nodules and mixed ground glass nodules, and lung nodules containing ground glass density are called ground glass nodules. A ground-glass shadow is a dense, thin shadow that appears on chest imaging, and CT shows a well-defined or ill-defined hyperdense shadow within the lungs, but the lesion is not dense enough to obscure the blood vessels and bronchial shadows that travel through it. If there are ground glass nodules or ground glass shadows on examination, it is recommended to go to the hospital in time, improve the examination, and carry out standardized treatment under the guidance of the doctor.