Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is moderately enlarged , which is likely unchanged when compared to the prior study when accounting for differences in technique . The mediastinal and hilar contours are unremarkable . There is minimal pulmonary vascular congestion but no overt pulmonary edema . Small bilateral pleural effusions are likely present , and more focal opacity within the retrocardiac region may reflect atelectasis though infection can not be excluded . No pneumothorax is identified . No acute osseous abnormalities are seen .
    OUTPUT:
    
Moderate cardiomegaly with mild pulmonary vascular congestion but no overt pulmonary edema . Small bilateral pleural effusions . Retrocardiac opacity may reflect atelectasis though infection can not be excluded .