Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Heart size is difficult to assess given the presence of a large left pleural effusion , substantially enlarged from the previous study . Small right pleural effusion also appears somewhat increased from prior . Bibasilar airspace opacities may reflect compressive atelectasis , but infection can not be completely excluded . No pulmonary edema is clearly noted . There is no pneumothorax . Atherosclerotic calcifications of the aortic knob are seen . There are moderate degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Large left and small right pleural effusions , larger in the interval . Bibasilar opacities may reflect atelectasis but infection can not be excluded .