Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is intubated . The endotracheal tube terminates near the thoracic inlet . The lung volumes are very low . However , there is no evidence for focal opacification . There is no pleural effusion or pneumothorax . The upper half of the abdomen is included and shows marked colonic dilatation , which is incompletely characterized , although pneumatosis is visible in large bowel . Portal venous gas is widespread within the liver . There is no definite free air collection .
    OUTPUT:
    
Colonic dilatation with pneumatosis and portal venous gas , otherwise incompletely characterized . At the time of interpretation the patient was already in the operating room .