Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are pacemakers overlying the chest bilaterally , with leads that appear intact in the right atrium , and two in the right ventricle . The patient is status post median sternotomy and CABG , with sternotomy wires that appear intact and appropriately aligned . There are linear opacities at the bases bilaterally , representing atelectasis . The lungs are otherwise clear . Heart size is stable . The mediastinal and hilar contours are stable . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Pacemaker leads in appropriate positioning without any evidence of pneumothorax . 2 . Bibasilar atelectasis .