Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear unchanged . Patchy scarring at the left lung apex is stable . A nipple shadow is visualized on the right . The lungs appear otherwise clear . There is no evidence for pleural effusion or pneumothorax . Slight degenerative changes along the thoracic spine are similar .
    OUTPUT:
    
No evidence of acute disease .