Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal . There is an area of volume loss / early infiltrate in the retrocardiac region . There small bilateral effusions , similar in size compared to prior . There is no pneumothorax . The osseous structures are unremarkable
    OUTPUT:
    
New small retrocardiac opacity that could be due to volume loss or infiltrate