Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . The cardiac and mediastinal silhouettes are stable . The lungs are relatively hyperinflated and there is again slight elevation of the right hemidiaphragm . Subtle patchy right base opacity is new since the prior study , and could be due to underlying infection , aspiration , or atelectasis . The left lung is clear . No large pleural effusion is seen . There is no pulmonary edema .
    OUTPUT:
    
New medial right lung base opacity could be due to infection , aspiration , or atelectasis . No pulmonary edema .