Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is borderline enlarged but unchanged . Aortic knob calcifications are again noted . Mediastinal and hilar contours are unchanged . Lungs are hyperinflated with emphysematous changes re - demonstrated , most pronounced in the upper lobes . There is no focal consolidation or pneumothorax . Minimal blunting of the left costophrenic sulcus on the frontal view is unchanged , and could relate to pleural thickening . Linear scarring within the left upper lobe is unchanged . Mild interstitial prominence at the lung bases is improved compared to the previous exam and may reflect chronic changes . Remote right - sided rib fractures are noted . No subdiaphragmatic free air .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No subdiaphragmatic free air .