Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear normal . There is a possible trace pleural effusion on the right , none on the left . The lungs appear clear . There is moderate S - shaped curvature to the thoracolumbar spine .
    OUTPUT:
    
Possible trace pleural effusion on the right ; otherwise unremarkable .