Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Marked cardiomegaly is stable from the most recent prior examination . There is mild pulmonary vascular congestion and mild interstitial edema . There are no pleural effusions or pneumothorax . Opacity at the base of the right lung likely reflects mediastinal fat , scarring and atelectasis as demonstrated on recent CT .
    OUTPUT:
    
Marked cardiomegaly and mild vascular congestion and interstitial edema . Right basal opacity likely reflects mediastinal fat , and scarring / atelectasis however underlying infection should be considered in the appropriate clinical setting .