Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . The right lung is clear . Linear opacity across the left lower lung field likely represents scarring vs atelectasis . There is moderate cardiomegaly and equivocal bulky hila , but the cardiomediastinal and hilar contours are unchanged from prior . There is no pleural effusion or pneumothorax . Sternotomy wires are noted in the midline and there are no other fractures .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .