Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates multiple intact median sternotomy wires and evidence of prior CABG procedure . The heart is prominent , but likely accentuated by AP technique and low lung volumes . There are aortic arch calcifications , unchanged . Mild interstitial prominence is long standing and certainly less pronounced on current exam . There is no overt pulmonary edema . There is no large pleural effusion . There is subsegmental atelectasis in the retrocardiac region . There is no pneumothorax or pneumomediastinum .
    OUTPUT:
    
Low lung volumes . No overt pulmonary edema .