There is no such thing as a good or bad pure ground glass nodular shadow. Pure glass nodular shadows can be caused by inflammation, bleeding and other benign diseases, or by lung cancer. Generally, benign pure ground glass nodule shadow is small, not accompanied by burr sign, vacuole sign, abnormal air bronchus sign, pleural depression sign and other manifestations. Pure ground-glass nodular shadows are nodular shadows that appear like ground-glass in the chest CT examination with a thin, hyperdense image in the lung window, and the degree of hyperdensity is not enough to cover the blood vessels and bronchioles that are distributed in the region, and the nodular shadows are similar to ground-glass. Pathologies such as alveolar hemorrhage, inflammatory infiltration, and tumor infiltration may be manifested as pure ground-glass nodular shadows. Both benign and malignant lesions can be manifested as pure ground-glass nodular shadows, and patients should go to the hospital in time after discovering ground-glass nodular shadows, and be treated according to the doctor’s guidance and suggestions.