Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube ends 2 .5 cm above the carina . The nasogastric tube has been advanced . Left retrocardiac opacity persists and could represent the large hiatal hernia however infection and aspiration are not excluded . There is no large pleural effusion or pneumothorax . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
1 . Interval advancement of and a gastric tube into the left upper quadrant . 2 . Persistent left retrocardiac opacity could represent a large hiatal hernia however infection and aspiration are not excluded .