Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable supine chest film of ___ at 04 : 14 is submitted .
    OUTPUT:
    
Patient is status post median sternotomy with postoperative cardiac and mediastinal contours . The aorta is somewhat unfolded and tortuous . Lung volumes are low with faint opacities at both bases most likely representing patchy atelectasis in this setting of low lung volumes . No evidence of pulmonary edema , pleural effusions or pneumothorax .