Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size appears mildly enlarged but unchanged . The mediastinal and hilar contours are similar . Lung volumes are low with crowding of bronchovascular structures , but no overt pulmonary edema is present . Increased interstitial markings are noted bilaterally , which may reflect chronic interstitial abnormality , as seen previously , with superimposed bibasilar atelectasis . No focal consolidation , pleural effusion or pneumothorax is clearly noted . Multiple left axillary clips are again noted as well as a remote posterior left rib fracture .
    OUTPUT:
    
Increased interstitial markings bilaterally suggests a chronic interstitial abnormality with probable superimposed bibasilar atelectasis .