What does it mean to have two lungs?

It is normal for both hilars to be small. Enlargement of both hilars found on chest X-ray or chest CT often reflects the presence of diseases such as lung tumors and tuberculosis, which can cause hilar enlargement. In addition, there are other diseases that may also cause enlargement of the hilum, such as severe cor pulmonale causing dilation of pulmonary blood vessels, which can also be manifested as enlargement of the hilum, sarcoidosis can be manifested as enlargement of bilateral hilar lymph nodes, and can also be manifested as enlargement of the hilum.