Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is slight blunting of posterior costophrenic sulci suggestive of trace effusions , but not substantial . There is no pneumothorax . The lungs appear clear . Mild S - shaped curvature is noted along the thoracolumbar spine . The patient is status post lower anterior cervical fusion , which is not assessed in detail .
    OUTPUT:
    
Trace pleural effusions . No evidence of pneumonia .