Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate right pleural effusion is again seen , with increasing overlying atelectasis . The left lung remains clear . No left pleural effusion is seen . There is no evidence of pneumothorax . The cardiac and mediastinal silhouettes are stable . The patient is status post median sternotomy and cardiac valve replacement . .
    OUTPUT:
    
Mildly increased moderate right pleural effusion with increasing overlying atelectasis .