Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Recently described asymmetrical pulmonary edema has slightly improved , particularly in the right perihilar and basilar regions . Cardiomediastinal contours are stable in appearance . Persistent dense left retrocardiac opacity , likely due to a combination of left lower lobe atelectasis and adjacent pleural effusion . Small - to - moderate right pleural effusion has decreased since the prior study . Subcutaneous emphysema is present in the supraclavicular regions bilaterally .
    OUTPUT:
    
Improving asymmetrical pulmonary edema and decreasing right pleural effusion . Persistent left lower lobe atelectasis and effusion .