Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate pacemaker with leads in appropriate position . Aorta is tortuous . The patient has had a median sternotomy . While there are no focal areas of opacities that are concerning for consolidation or infectious process . Bilateral ___ opacities , potentially scarring are unchanged . There are several areas of linear atelectasis , particularly in the left mid lobe . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
No overt evidence of pneumonia . Bilateral atelectasis .