Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates well expanded clear lungs . The cardiomediastinal and hilar contours are unchanged . No pleural effusion , pneumothorax , or consolidation . The nasogastric tube appears to be different as compaired to ___ , and no radiodense tip is present . The nasogastric tube tip is likely post-pyloric .
    OUTPUT:
    
Nasogastric tube appears to have been changed as compared to ___ , and no radiodense tip is identified . The nasogastric tube tip is likely post-pyloric .