Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle bilateral lung opacities , mostly predominant in right upper lobe , have improved since the previous exam . There is no new lung consolidation or volume loss . The patient had prior sternotomy . The sternal wires are in unchanged position . Mediastinal and cardiac contours are normal . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Mild bilateral opacities mostly predominant in right upper lobe have improved . 2 . There is no new cardiopulmonary finding .