Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest film ___ at 23 : 17 is submitted .
    OUTPUT:
    
A left - sided pacer remains in place . There is continues to be retrocardiac consolidation which may represent pneumonia or aspiration . Scarring in both upper lobes with some associated volume loss and associated biapical pleural thickening , right greater than left , is unchanged . No pulmonary edema . No pneumothorax . Overall cardiac and mediastinal contours are stable .