Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates hyperexpanded lungs with a stable relative opacification of the lung bases likely exaggerated by hyperlucencies in the upper lung zones . No focal opacification concerning for pneumonia identified . Mediastinal and hilar contours are unremarkable . Mild enlargement of cardiac silhouette is unchanged . Atherosclerotic changes noted in the aortic arch . No compression fracture identified .
    OUTPUT:
    
No acute cardiopulmonary process . Hyperexpanded lungs consistent with provided diagnosis of COPD . Stable mild cardiomegaly .