Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung is clear . Interval increase in retrocardiac opacity . No right pleural effusion . Persistent blunting of the left costophrenic angle may be related to atelectasis , scarring , or trace pleural effusion . No pneumothorax . Stable mild cardiomegaly is likely accentuated due to patient positioning . Mediastinal contour and hila are unremarkable . Again seen is levoscoliosis of the thoracolumbar spine .
    OUTPUT:
    
1 . Increase in retrocardiac opacity may represent atelectasis however pneumonia can not be excluded . 2 . Persistent blunting of left costophrenic angle may be related to atelectasis , scarring , or trace pleural effusion .