Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume and show bibasilar atelectasis . The cardiomediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . There is moderate amount of free air underneath the diaphragm with a dilated loop of bowel .
    OUTPUT:
    
Intraperitoneal free air with dilated loop of small bowel suggesting free viscus perforation and possibly obstruction or peritonitis . The findings were discussed with Dr . ___ at 10 : 15 pm on ___ by telephone .