Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright chest radiograph demonstrates interval placement of a nasogastric tube which appears to be looped within the upper esophagus . Lung volumes are low . Allowing for this , cardiomediastinal and hilar contours are similar and within normal limits . There is no pleural effusion , pulmonary edema , or pneumothorax . No focal opacity is identified bilaterally . There is no air under the right hemidiaphragm .
    OUTPUT:
    
Interval placement of nasogastric tube which appears looped within the upper esophagus for which repositioning is advised .