Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube , the Swan - Ganz , the mediastinal and chest tubes are in unchanged position . There is no visible pneumothorax . There is decreased amount of left mild pleural effusion . Stability of the left retrocardiac atelectasis . Status post median sternotomy for CABG . The mediastinal and cardiac contour are unchanged .
    OUTPUT:
    
The left mild pleural effusion has decreased . The rest of the exam is unchanged .