Few foci of fibrosis in the lower right lobe of the lung are usually indicative of chronic infections in the lower right lobe of the lung, including tuberculosis infection, bacterial infection and alveolar stasis due to cardiovascular disease, such as left heart failure. Therefore, once a small fibrous foci in the lower lobe of the right lung are detected by imaging, further high-resolution CT examination of the chest is required to further evaluate the size and distribution of the foci. Usually the fibrous foci have no clinical symptoms and are not accompanied by chest tightness, shortness of breath, cough and sputum. If accompanied by severe infection, blood in the sputum may occasionally appear, and further screening for inflammation, tuberculosis, and tumor is required. Generally, high-resolution CT of the chest is the main test to confirm the diagnosis of a few fibrous foci in the lower lobe of the right lung. If abnormal changes are found in the foci, further enhanced CT of the chest is given, and if necessary, fiberoptic bronchoscopy with alveolar lavage fluid is given to further screen for inflammation, tuberculosis, and tumors.