Does a growing ground-glass nodule mean it is malignant?

Whether a growing ground-glass nodule is malignant should be determined based on the nodule's size or whether it is caused by inflammation.

1. Generally, the malignancy potential of a ground-glass nodule is related to its size. Micronodules smaller than 2 mm in diameter have a very low probability of being malignant; ground-glass nodules smaller than 5 mm have a malignancy rate of 0%–1%; those measuring 11–20 mm have a malignancy rate of 33%–64%; and those larger than 20 mm have a malignancy rate of 64%–83%. Therefore, the larger the diameter of a ground-glass nodule, the higher the likelihood of malignancy.

2. Many nodules that increase rapidly over a short period are more likely to be inflammatory lesions. Truly neoplastic (tumor-related) ground-glass nodules generally do not grow quickly within one or two months. However, this does not apply if the nodule is already known to be a ground-glass nodule, as such nodules could represent minimally invasive adenocarcinoma or carcinoma in situ—both of which may appear as ground-glass opacities and can remain stable for a long time without significant change.

Patients with pulmonary nodules must seek immediate medical evaluation and receive appropriate treatment. It is essential to quit smoking, as harmful substances in tobacco can directly damage lung health. Maintaining healthy dietary habits is important—meals should be light, avoiding spicy, irritating, and greasy foods. Drinking plenty of water daily helps increase basal metabolic rate, aids in eliminating metabolic waste from the body, especially toxins and debris accumulated in the lungs, and promotes the repair of damaged organ cells.