Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy . Allowing for differences in technique , the cardiac , mediastinal and hilar contours appear unchanged . There is again a quite elevated hemidiaphragm . Band - like opacities in the right middle and lower lobes suggest atelectasis which has increased somewhat . The left lung remains clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Elevated right hemidiaphragm with patchy right basilar opacity suggestive of atelectasis . No evidence for acute cardiopulmonary disease or free air .