Enlarged hilar shadow can be seen in lung occupation, mediastinal lymph node tuberculosis, central lung cancer, cardiovascular disease and other diseases. 1. Lung occupation: Lung occupation can be manifested as enlarged hilar shadow on imaging due to the occupation of the lesion. In addition, lung occupation can cause enlargement of hilar lymph nodes, which can also be manifested as enlargement of hilar shadow. 2. Tuberculosis of mediastinal lymph nodes: Tuberculosis of mediastinal lymph nodes can also present with enlargement of bilateral hilar lymph nodes, which may appear as enlarged hilar shadows on imaging. 3. Centralized lung cancer: centralized lung cancer can cause enlargement of hilar shadow due to the occupation of mass. When lung cancer is accompanied by enlarged lymph nodes, it can also be manifested as enlarged hilar shadow at the same time. 4. Cardiovascular disease: cardiovascular disease may cause heart failure and compensatory widening of pulmonary blood vessels, which may also cause enlargement of hilar shadow. It is recommended to consult a doctor in time and follow the doctor’s instructions for examination and treatment.