Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The aorta is tortuous , similar to the prior chest radiograph . Bilateral lower lobe opacities represent atelectasis . Otherwise , the lungs are clear without focal opacity , pleural effusion or pneumothorax . Multiple mediastinal clips are median sternotomy wires are related to prior CABG .
    OUTPUT:
    
No new opacity concerning for pneumonia .