Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart appears to be mildly enlarged . Cardiomediastinal contours are unremarkable . Again , blunting of the right costophrenic angle is noted along with elevation of the right hemidiaphragm . This could be due to atelectasis or in the proper clinical context could represent underlying pneumonia ; however , the degree of opacification has not significantly changed from the prior study . No pneumothorax . Bony structures appear to be intact .
    OUTPUT:
    
The right lower lobe opacity which probably represents a small amount of pleural effusion with an overlying atelectasis or possibly pneumonia in the right clinical context , has not significantly changed since the prior exam .