Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Blunting of left costophrenic angle reflects a moderate left pleural effusion with associated atelectasis . Patient is status post median sternotomy , CABG and aortic valve replacement . Remaining visualized lung is clear though the right costophrenic angle is not fully seen . The cardiac mediastinal silhouette is unchanged .
    OUTPUT:
    
Moderate left pleural effusion .