Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi supine radiograph of the chest demonstrates hyperexpanded lungs . Persistent opacification of the right lower lung and retrocardiac space likely represents pneumonia . The cardiomediastinal and hilar contours are unchanged . There is no pneumothorax . There is a probable small right - sided pleural effusion . The endotracheal tube ends 4 .4 cm from the carina . The nasogastric tube courses into the stomach and out of the field of view .
    OUTPUT:
    
Persistent opacification of the right lower lung and retrocardiac space likely represents pneumonia . .