Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal and hilar contours are within normal limits . Again noted is an air - filled distended stomach which projects across the midline and of the right hemidiaphragm . There is a dense retrocardiac opacity concerning for infection . The right lung appears clear . There is no pneumothorax or pleural effusion identified .
    OUTPUT:
    
Retrocardiac opacity is concerning for pneumonia . Distended , gas - filled stomach is demonstrated and unchanged from the prior exam ___ .