Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is within normal limits . The mediastinal and hilar contours are normal . The lungs are clear . There is no pleural effusion or pneumothorax . Degenerative changes are present in the thoracic spine . Clips in the right axilla are compatible with prior lymph node dissection .
    OUTPUT:
    
No evidence of pneumonia .