Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly has been stable compared to exams dating back to ___ . Redemonstrated is a small hiatal hernia . The hilar and mediastinal contours are normal , without evidence of pneumomediastinum . The lungs are clear without evidence of focal consolidations concerning for pneumonia . There is mild left basilar atelectasis . There is no pleural effusion or pneumothorax . There is no subdiaphragmatic free air . An old right 7th rib fracture is present .
    OUTPUT:
    
No pneumomediastinum or pneumoperitoneum .