Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable view of the chest demonstrates low lung volumes , which accentuate bronchovascular markings . Bibasilar opacities , right greater than left , are essentially unchanged since study obtained one day prior , compatible with atelectasis . There no pulmonary edema . Hilar and mediastinal silhouettes are unchanged . Heart size is normal . No pneumothorax . Small pleural effusions are likely . Patient is status post medial sternotomy and CABG . Aortic arch calcifications are noted . Lumbar spine fixation hardware is in place and incompletely characterized .
    OUTPUT:
    
In comparison to ___ exam , there is no significant interval change in low lung volumes and bibasilar atelectasis , right greater than left .