Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post previous median sternotomy and coronary bypass surgery with stable appearance of the cardiomediastinal contours . New since the prior study are small bilateral pleural effusions with adjacent bibasilar opacities , right greater than left . Appearance of the sternotomy site is unchanged in the interval .
    OUTPUT:
    
Bilateral small pleural effusions are new since ___ and are accompanied by adjacent bibasilar opacities . Although potentially due to atelectasis , superimposed pneumonia in the right lung base should be considered in the appropriate clinical setting .