Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , there has been removal of bilateral thoracostomy tubes . The patient is status post sternotomy . Moderate cardiomegaly appears stable . There has been interval improvement of interstitial edema and central vascular congestion since ___ . Bibasilar opacities remain , in particular a large rounded density at the right base , unchanged over multiple studies dating back to ___ . No new opacities are seen . There is a persistent left retrocardiac density which may represent severe atelectasis or underlying consolidation .
    OUTPUT:
    
1 . Interval improvement of interstitial edema . 2 . Severe bibasilar atelectasis . Underlying consolidations can not be excluded . 3 . Moderate cardiomegaly .