Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . A moderate right pleural effusion has increased since ___ . Opacities in the right lower lung most likely represent atelectasis ; however , superimposed infection can not be excluded . The previosly seen left lung opaciites have cleared . The left lung is now well expanded . There is no pneumothorax . The aortic knob is calcified . The heart size is normal .
    OUTPUT:
    
Interval increase in a moderate right pleural effusion . adjacent right lower and middle lobe opacities most likely represent atelectasis , but superimposed infection can not be excluded .