Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette remains moderately enlarged . Mediastinal contours are stable . The hilar contours are stable . There is blunting of the right costophrenic angle and slight increase of opacity at the right lung base . No large pleural effusion is seen although a trace effusion be difficult to exclude . There is minimal central vascular congestion . No evidence of pneumothorax .
    OUTPUT:
    
Persistent moderate enlargement of the cardiac silhouette . Minimal central vascular congestion . Right basilar opacity , differential diagnosis includes infection , aspiration , trace pleural effusion with overlying atelectasis .