Milled glass nodules in the dorsal segment of the right lower lobe of the lung are serious if they are caused by malignant tumors, and mostly less serious if they are caused by benign conditions such as inflammation. The dorsal segment of the right lower lobe is the segment of the lung located in the upper part of the right lower lobe, and the risk of malignancy of a pulmonary nodule is not directly related to the location of the nodule. Frosted glass nodules are cloudy, slightly dense shadows found on chest CT, which can be caused by benign diseases such as pneumonia, tuberculosis, sarcoidosis, and misshapen tumors, or malignant diseases such as bronchopulmonary cancer. If it is caused by benign diseases such as pneumonia, it is not serious, and can be cured or improved by timely treatment. Only some patients with severe pneumonia and severe tuberculosis have poor prognosis, which may be life-threatening. If it is caused by malignant tumors such as lung cancer, it is serious, only early lung cancer patients can be clinically cured by radical surgery and other treatments, while patients with middle and late lung cancer will suffer from poor survival and life-threatening condition. Ground glass nodules also need to be evaluated in combination with the presence of solid components, nodule size, morphology, margins, calcification and so on. Patients are advised to consult a specialist for initial assessment of malignancy risk and follow up or treatment as prescribed.