High density shadow in the lower lobe of the right lung is a lesion in the lung tissue in the right lower part of the lung lobe, which is manifested as higher density than normal lung tissue in the lesion in the lower lobe of the right lung in the CT examination, and it may be caused by lung infections, tuberculosis, lung tumors, and other diseases. 1. Lung infection: when the patient’s lungs are infected, pathogens such as bacteria and viruses invade the alveoli of the lungs, and inflammatory exudation occurs in the local tissues, which leads to the increased density shadow. 2. Tuberculosis: after infection by Mycobacterium tuberculosis, which leads to fluid exudation and hemorrhage in the lung cavity, the lesion area can be shown as a high-density shadow on chest ct. 3. Lung tumor: no matter benign tumor or malignant tumor, its density is higher than that of lung tissue, because the lung tissue is gas, low density, so if there is a lung tumor, it can be shown as a high-density shadow in ct examination. Don’t be alarmed if there is a high density shadow in the lungs when you do the examination in the hospital, you should consult the doctor’s opinion in time and do the corresponding treatment under the doctor’s suggestion.