Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours are unremarkable . Slight biapical pleural thickening is unchanged . The lungs appear clear aside from minimal left basilar atelectasis or scarring . There is no pleural effusion or pneumothorax . Mild - to - moderate degenerative changes are noted along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .