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 within unchanged limits . There is persiste3nt moderate relative elevation of the right hemidiaphragm compared to the left side . An opacity in the right lower lobe suggesting atelectasis or scarring appears unchanged . Streaky left basilar opacity also suggests minor atelectasis or scarring which is unchanged . Small pleural effusions are difficult to entirely exclude . There is no pneumothorax .
    OUTPUT:
    
Persistent right basilar opacity with elevation of the right hemidiaphragm , but no definite superimposed acute process .