Ground glass nodules with a density value of minus 550 may be caused by pneumonia, tuberculosis, fibrosis, precancerous lesions, early lung cancer, etc. They are not serious if they are benign, but serious if they are malignant.
Ground glass nodule (GGN) is a non-specific imaging manifestation, which is triggered by the incomplete filling of alveoli or the decrease of air content due to various reasons.GGN can be seen in a variety of nature of lesions, such as pneumonia, tuberculosis, focal fibrosis, atypical adenomatous hyperplasia, or early stage lung cancer, etc. Typical CT value of GGN is about 1.5 mm, which is the same as the CT value of lung cancer.
The CT value of typical GGN is about -600 to 680 HU. If it is diagnosed as lung inflammation, tuberculosis, focal fibrosis, etc. after comprehensive examination, it is a benign nodule and is not serious; if it is atypical adenomatous hyperplasia (precancerous lesion), or early-stage lung cancer, etc., it should be treated in time, and if it is not well controlled and allowed to develop, it may jeopardize the patient’s life.
It is recommended that the patient should seek medical treatment in time, specifically under the guidance of the doctor for judgment and treatment.