Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re - demonstrated is mild enlargement of cardiac silhouette . The aortic knob is densely calcified . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is not engorged . There is hyperinflation of lungs with flattening of the diaphragms is compatible with COPD . Linear opacities at the lung bases are compatible with scarring and bronchiectatic changes , similar compared to the previous exam . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Unchanged bronchiectasis within the lung bases .