Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy and coronary artery bypass graft surgery . The cardiac , mediastinal and hilar contours appear stable . There is persistent right perihilar opacification and more vague opacification throughout the right mid-to - lower lung . However , compared to the most recent prior there has been marked interval improvement in the extent of opacification . This appearance is most suggestive of resolving pneumonia but is not specific . Persistent or recurrent acute process such as pneumonia is not excluded . It is also possible that opacification may be due to pulmonary hemorrhage noting the given history of hemoptysis .
    OUTPUT:
    
Persistent but markedly improved right lung opacification .