Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . Mediastinal and hilar contours are normal and unchanged from prior exams . The lungs are clear of consolidation and no masses , specifically apical masses are present . Hyperexpansion of the lungs suggests emphysema . Mild apical scarring is present . There is no pleural effusion or pneumothorax . Mild S - shaped scoliosis of the thoracolumbar spine is demonstrated .
    OUTPUT:
    
No evidence of pulmonary masses .