Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . No focal opacity is demonstrated . Mild - to - moderate rightward convex curvature is again centered along the mid thoracic spine . Mild degenerative changes are similar along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .