If the pulmonary ground-glass nodule reaches 15mm, it should be closely observed, if there is no change, continue to review regularly, if it becomes significantly larger, then the nature of the nodule should be clarified. 1. No change in the review: pulmonary ground-glass nodules can be divided into benign and malignant nodules, generally benign nodules develop slowly and do not have a greater impact on the patient’s health, so they can be left untreated. Patients do not need to be too nervous when they find pulmonary ground glass nodules, the size of 15mm is not very big, and there is no obvious change after review, so they can be left untreated and continue to have regular review. 2. If the nodule becomes bigger in review: if the size of the nodule changes in review and shows progressive enlargement, then tissue biopsy is needed to clarify the nature of the nodule so as to carry out subsequent surgery and other treatments. If you find a pulmonary ground glass nodule 15mm, we suggest that you consult a doctor in time to avoid delaying your condition.