Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates hyperexpanded lungs . Persistent bibasilar opacities likely represent pneumonia . The cardiomediastinal and hilar contours are unchanged . No pneumothorax . Endotracheal tube ends 4 .9 cm from the carina . Nasogastric tube courses into the stomach and out of the field of view .
    OUTPUT:
    
Stable bibasilar opacities likely represent pneumonia .