Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are normal . There is mild left basal opacity which likely represents atelectasis or scarring . Otherwise lungs are clear . No pleural effusion , or pneumothorax . No evidence of pneumoperitoneum is identified .
    OUTPUT:
    
No signs of pneumoperitoneum . No acute findings .