Frosted glass density shadow in the lung appears as a result of CT lung examination, as the name implies, it is similar to a round nodule and has a frosted glass appearance, which is generally considered to be a pre-tumor disease, for further determination of the disease requires a puncture examination, which is only one of the conditions. There is also a lung condition that can lead to this kind of examination, such as inflammation of the lung and cause bleeding and fibrosis, this kind of examination will also appear frosted glass density shadow, in the early examination of lung disease in this situation need to diagnose the disease as soon as possible, the prognosis of the disease has an important role. In clinical practice, this condition does not represent a specific lesion, but is only a reference, and the specific condition requires further examination.