Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is background COPD , with hyperinflation an flattened diaphragms . Heart size is at the upper limits of normal or slightly enlarged , with slightly unfolded aorta . There is subsegmental atelectasis or scarring at both lung bases . No CHF , focal infiltrate , or effusion is identified .
    OUTPUT:
    
Background COPD and borderline cardiomegaly . No acute pulmonary process identified .