Flocculent and patchy hyperdensity in the lungs is a description of lung imaging, which mostly suggests inflammation caused by various physicochemical factors, and common factors include lung infections and lung tumors. 1. Lung infection: Lung infection is the most likely cause of flocculent and patchy hyperdense images, which are accompanied by fever, cough, sputum and dyspnea in some patients. Common sources of infection include bacteria, fungi, Mycobacterium tuberculosis, etc., among which bacterial infection is the most consistent with the above description. 2. Lung tumor: Lung tumor blocks the bronchial tubes, causing obstructive pneumonia and the above imaging changes. Enhanced CT, fiberoptic bronchoscopy and tumor marker examination can be combined to assist in the differentiation. If the physical examination finds flocculent or patchy hyperdense shadow in the lower lobe of the left lung, attention should be paid to it, and it should be further diagnosed and treated in the regular hospital.