Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previously seen right upper lobe pneumonia has resolved . Heart size is enlarged . Pulmonary vasculature is ingested . There is mild interstitial edema but no large pleural effusion . Retrocardiac opacification likely represents atelectasis , however early infection can not be excluded .
    OUTPUT:
    
Moderate vascular congestion of mild interstitial edema . Retrocardiac opacification likely reflective atelectasis , however early infection can not be excluded .