Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperexpanded lungs with flattening of the hemidiaphragms correlate with the patient 's known history of emphysema . No confluent consolidation is identified . Subtle opacities within the right mid lung may reflect residual scarring from prior pneumonia at that site . There is no pulmonary edema or pleural effusions . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
1 . Hyperexpanded lungs consistent with chronic obstructive pulmonary disease . 2 . Subtle right mid lung opacities likely reflect scarring from prior pneumonia at that site . 3 . No acute consolidation or effusion .