Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar airspace opacities likely represent atelectasis . There is no pleural effusion , pneumothorax , or frank pulmonary edema identified . The cardiomediastinal silhouette is severely enlarged , but unchanged from prior examination . No acute osseous abnormalities are detected .
    OUTPUT:
    
Cardiomegaly . Bibasilar densities likely represent atelectasis as opposed to early infiltrate .