Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior study the pulmonary edema continues to improve . However there is persistent increased opacity in the right upper lung which could reflect residual asymmetric pulmonary edema but an underlying infectious process is possible . Stable top - normal heart size . The small left pleural effusion persists with associated atelectasis . No pneumothorax .
    OUTPUT:
    
Improvement in pulmonary edema now with asymmetric opacification of the right upper lung which could reflect asymmetric residual pulmonary edema ; however , underlying infectious process is possible .