Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is moderate to severely enlarged , slightly increased compared to the prior exam . The mediastinal contours unchanged . There is mild pulmonary edema with perihilar haziness and vascular indistinctness . No focal consolidation , pleural effusion or pneumothorax is visualized . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild congestive heart failure .