Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube tip is approximately 6 .3 cm above the carina . Enteric tube courses below the diaphragm and out of view . Low lung volumes cause bronchovascular crowding and accentuation of the cardiac silhouette . Dense retrocardiac opacity is worse compared to prior . There is no pneumothorax . Cardiomegaly is moderate , as on prior . No free air below the right hemidiaphragm is seen . Calcified right styloid process is similar to ___ .
    OUTPUT:
    
Dense retrocardiac opacity is worse compared to prior , likely a combination of atelectasis , effusion , and in the proper clinical setting , possibly infection .