Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild to moderately enlarged . The mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . Streaky anterior opacity in the lateral views suggests minor atelectasis or scarring in the right middle lobe . Bony structures appear within normal limits .
    OUTPUT:
    
No evidence for significant change or acute disease .