Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to ___ , the right upper lobe and perihilar right - sided parenchymal opacity have slightly improved . Small right and moderate left pleural effusion persist in almost unchanged manner . No new focal parenchymal opacities . Retrocardiac atelectasis is stable . No overt pulmonary edema .
    OUTPUT:
    
Slight improvement in right upper lobe and hilar opacities .