Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right lower lung opacities and pleural effusion has improved . There is only minimal residual bilateral pleural effusion . Prior sternotomy was done for CABG . There is no pneumothorax .
    OUTPUT:
    
Improvement of right lower lung opacities and pleural effusion . There is only small residual bilateral pleural effusion .