Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary artery bypass graft surgery . The cardiac , mediastinal and hilar contours appear unchanged . There is persistent opacification of the left lung base with a pleural effusion , but probably decreased somewhat . What is new , however , is an opacity in the right lower lung , probably in the right lower lobe , noting that it does not silhouette either the right cardiac border or hemidiaphragm .
    OUTPUT:
    
Improving opacity at the left lung base , probably reflecting for the most part decreasing pleural effusion . New right basilar opacity , in the appropriate clinical setting compatible with pneumonia .