Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There are bibasilar opacities likely due to atelectasis . No pneumothorax . Heart size is top normal , unchanged from prior . Multiple mediastinal clips and sternotomy wires from prior CABG . Unchanged position of transvenous pacemaker .
    OUTPUT:
    
Bibasilar opacities , likely due to atelectasis . Lung volumes are low bilaterally .