Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Slight elevation of the left hemidiaphragm compared to the right may reflect volume loss . Otherwise , the lungs appear clear . Mild rightward convex curvature is centered along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .