Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , pleural effusion or pneumothorax . Previously demonstrated right infrahilar opacities have improved . There is stable enlargement of the main pulmonary artery . There is moderate cardiomegaly which is unchanged . Again seen is mild retrocardiac atelectasis , unchanged .
    OUTPUT:
    
Improved right infrahilar patchy opacity , possibly atelectasis or resolving asymmetric pulmonary edema . Unchanged mild left retrocardiac atelectasis .