There are many reasons for right hilar fullness, the common ones are pneumonia, lung cancer, congenital heart disease and so on. 1. Pneumonia: If pathogens cause right lung infection, it can lead to expansion of blood vessels and lymphatic vessels in the right hilar area, and right hilar fullness can be seen in imaging examination. 2. Lung cancer: if the lymph nodes of lung cancer metastasize to the lymph nodes of the right hilar, the hilar can be enlarged and full on imaging. 3. Congenital heart disease: in case of atrial septal defect, imaging examination will show protruding pulmonary artery segment and fullness of right hilar. Right hilar fullness may also have other causes such as pulmonary hypertension, etc. If the examination found that the right hilar fullness, we should improve the examination in a timely manner to clarify the cause of the disease, and standardized treatment under the guidance of the doctor.