Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are stable in the postoperative . In this patient who is undergone recent median sternotomy and coronary bypass procedure . Multifocal patchy and linear atelectasis in the mid and lower lungs has partially improved . No new or worsening lung opacities are identified . Small pleural effusions are present bilaterally . Small peristernal gas collections are likely a a an expected postoperative finding of a as an incidental finding .
    OUTPUT:
    
Improving multifocal atelectasis . Small bilateral pleural effusions .