Left pulmonary plaque shadow is a common description in imaging reports, which specifically refers to a patchy, dense lesion in the left lobe of the lung, and most dense lesions indicate inflammatory changes, especially in infectious inflammatory diseases, such as tuberculosis and pneumonia. However, the exact type of infectious inflammation needs to be further clarified by combining clinical history, clinical symptoms and corresponding laboratory tests. For example, if there is significant chills, high fever, cough, sputum, and a significantly elevated blood white blood cell count, pneumonia is more likely to be the cause. If the clinical symptoms are dry cough, low fever in the afternoon, night sweats, wasting, etc., and the use of general antibiotics is ineffective, the possibility of tuberculosis is more likely to be considered. Therefore, the description of the imaging report of the left pulmonary plaque shadow, the specific meaning expressed and the corresponding disease are not unique.