Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hyperinflated . There is a rounded opacity measuring 3 .3 x 2 .3 cm projecting over the descending aorta , best seen on the lateral view . There is no pleural abnormality . The heart size is normal . The mediastinal and hilar contours are normal .
    OUTPUT:
    
Rounded opacity projecting over the descending aorta . Oblique views are recommended for further evaluation .