Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is unchanged . Aortic knob remains calcified . Mediastinal and hilar contours are stable . Pulmonary vasculature is not engorged . Hyperinflation of the lungs with centrilobular emphysematous changes are again noted , findings which are better seen on the previous CT . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .