Lower lobe of the left lung mass-like shadow with flaky blurred shadow is most likely due to pneumonia, tuberculosis and other causes. 1. Pneumonia: If the patient is diagnosed with pneumonia, the lungs may have lobular or mass-like high-density shadows. Pneumonia may be caused by bacterial or viral infections or dust contamination, and the patient may have symptoms such as coughing, hemoptysis, and respiratory distress. 2. Tuberculosis: Patients with tuberculosis may have flaky, dense shadows. Tuberculosis may be caused by respiratory infections or skin wounds. Patients may have symptoms such as night sweats (abnormal sweating after going to sleep, sweating stops after waking up), fatigue, poor appetite (poor appetite), etc. TB is usually contagious. There may also be other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.