Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hyperexpanded , with flattening of the diaphragm and biapical hyperlucency . There is mild atelectasis / scarring in the lingula . No focal consolidation . Heart size is normal . The aortic knob is calcified . No pleural effusion or pneumothorax .
    OUTPUT:
    
COPD . No acute process .