Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , the previously noted right basilar opacities appear improved . Bibasilar and retrocardiac atelectasis is also improved . The bilateral perihilar opacities persist and may represent continued mild pulmonary edema . The heart size is unchanged . No pneumothorax .
    OUTPUT:
    
1 . Improvement in right basilar opacities with persistence of bilateral perihilar opacities since ___ , compatible with persistent mild pulmonary edema .