Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . The lungs are clear ; subtle opacity at the right lung base likely represents the overlying breast shadow . There is no pleural effusion or pneumothorax . No subdiaphragmatic free air is present . Right axillary clips are compatible with prior lymph node dissection .
    OUTPUT:
    
No evidence of pneumonia , and no subdiaphragmatic free air .