Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph demonstrates low lung volumes . A right internal jugular central line appears to terminate at the cavoatrial junction . Blunting of bilateral costophrenic angles suggests scarring or alternatively small pleural effusions . Obscuraion of the left hemidiaphragm likely atelectasis though infection can not be excluded . Patient is status post median sternotomy . Heart is top - normal in size . There is no overt pulmonary edema .
    OUTPUT:
    
Low lung volumes with secondary bronchovascular crowding . No overt pulmonary edema . Obscuraion of the left hemidiaphragm likely atelectasis though infection can not be excluded .