Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild - to - moderate pulmonary edema has slightly worsened . The vessels are also more prominent and the heart contour still enlarged . The lung volumes are very low with bibasilar atelectasis and probable accompanying small pleural effusion . This patient had prior sternotomy for CABG .
    OUTPUT:
    
1 . Slight worsening of mild - to - moderate pulmonary edema . 2 . Unchanged bibasilar volume loss with accompanying small pleural effusion .