Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size remains mildly enlarged , unchanged . The aortic knob is calcified . The mediastinal and hilar contours are within normal limits . The pulmonary vascularity is normal . No focal consolidation , pleural effusion or pneumothorax is detected . Minimal peripheral linear opacity within the left mid lung field may reflect an area of subsegmental atelectasis . No acute osseous abnormalities are seen . Old right ___ posterior rib fracture is again noted .
    OUTPUT:
    
No acute cardiopulmonary abnormality .