Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is probably at the upper limits of normal size . The aortic arch is calcified . There are heterogeneous but confluent bilateral hazy opacities , somewhat more extensive on the right than left . Blunting of the right costophrenic sulcus suggests there may be a small effusion . There is no pneumothorax .
    OUTPUT:
    
Widespread bilateral lung opacification . Differential considerations include severe pulmonary edema ; other considerations include severe widespread pneumonia and respiratory distress syndrome among other less common causes .