Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slight flattening of the diaphragms could reflect mild COPD . Slight distortion of the parenchymal markings in the right lung could also reflect emphysematous change . Allowing for this , the heart is at the upper limits of normal in size . The aorta is unfolded . No CHF , focal infiltrate , pleural effusion , or pneumothorax is detected .
    OUTPUT:
    
Probable background emphysematous change . Heart size at the upper limits of normal . No acute pulmonary process identified .