Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright radiograph demonstrates an enteric tube which descends the thorax in an uncomplicated course . For proper placement within the gastric lumen , recommend advancing 3 cm . Lungs are hyperexpanded with flattening of the diaphragms suggestive of emphysema . Lungs are clear without a focal opacity convincing for pneumonia . Cardiomediastinal and hilar contours are within normal limits . No acute osseous abnormalities detected . Clips project over the mid upper abdomen . Dilated loops of small bowel are noted projecting over the upper quadrant . No air to the right hemidiaphragm is seen .
    OUTPUT:
    
For appropriate placement of nasogastric tube within the gastric lumen , recommend advancing 3 cm .