Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are similar along the mid thoracic spine where there is also slightly exaggerated kyphotic curvature .
    OUTPUT:
    
No evidence of acute disease .