Lung calcification refers to a high density opaque image of the lungs on chest imaging, and is most often caused by tuberculosis and chronic inflammation of the lungs, as well as by exposure to dust. Tuberculosis and chronic inflammation of the lungs can lead to destruction of the lung tissue, and the lungs are not able to be filled with normal lung tissue, but instead calcium salts are deposited in the diseased area, resulting in calcification of the lungs. In most cases, lung calcification is a sign of healing of the lesion. Calcified foci are also seen in patients who have been smoking for a long time and have been exposed to dust, especially silica, for a long time, forming calcified nodules in the lungs. Lung calcifications are mostly benign lesions and indicate recovery from the disease, but some calcification foci may be large enough to compress the airways or blood vessels or pull on the normal lobes of the lungs, causing respiratory symptoms such as coughing, coughing up sputum, hemoptysis, and chest tightness, which require prompt medical attention.