Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is clear , without evidence of pleural effusion or pneumothorax . Blunting of the left costophrenic angle is secondary to chronic scarring of the left lower lobe and appears unchanged since at least ___ . There is mild - to - moderate cardiomegaly which is unchanged since prior exam . The mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .