Striated shadows in the lower lobe of the right lung may be an old lesion, an infection within the lung, or even lung cancer. 1. Old foci: If the patient has traces of previous diseases, resulting in fibrous connective tissue hyperplasia that is difficult to be absorbed, chest imaging may reveal a patchy shadow in the lower lobe of the right lung. 2. Intrapulmonary infection: Patients who have smoked for a long time or inhaled dust particles, leading to lung tissue damage and then intrapulmonary infection. If there is fibrous connective tissue hyperplasia in the infection, the right lower lobe of the lung may have patchy shadows. 3. Lung cancer: If the patient smokes for a long time, coughs up sputum, has blood or blood clots in sputum, and is accompanied by symptoms of dyspnea and wheezing. After anti-infection treatment, there is no obvious dissipation and absorption, and it occurs repeatedly in the same location, lung cancer needs to be considered. In the presence of striated shadow in the lower lobe of the right lung with symptoms such as cough and sputum, it is recommended to further do chest CT, PPD examination, blood routine, blood sedimentation, tuberculin test, sputum smear for tuberculosis bacilli, bronchial fiberscope, etc., to make a clear diagnosis and treat the cause.