Fibrous foci in the middle lobe of the right lung may be the result of a previous infectious disease in the middle lobe of the right lung with fibrous connective tissue remaining after treatment, which appears as a fibrous streak-like shadow on imaging. The bronchial tubes in the middle lobe of the right lung are relatively narrow, and in patients who have suffered from a previous infectious disease in the right lung, fibrous connective proliferative tissue tends to be left behind after treatment, forming a fibrous streak-like shadow. Fibrous lesions in the middle lobe of the right lung usually do not cause clinical symptoms, and generally do not require special treatment, but need regular review. If symptoms such as cough, sputum, blood in sputum or even fever and chest pain occur, it is recommended to go to a regular medical institution for early detection and treatment to prevent the condition from deteriorating.