Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post recent median sternotomy and aortic valve replacement . Following removal of multiple support and monitoring devices , there is no definite pneumothorax . Stable postoperative appearance of cardiomediastinal contours . Further improvement in left perihilar airspace opacification as well as improved aeration in the left retrocardiac region . On the right , a small to moderate pleural effusion has increased in size with adjacent worsening atelectasis .
    OUTPUT:
    
Improving left perihilar and basilar opacities . Worsening small to moderate right pleural effusion .