Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Pacer leads of a left chest wall generator terminate in the right atrium and right ventricle . Mild cardiomegaly and mediastinal contours are stable . Lung volumes are low and the right hemidiaphragm is elevated , similar to prior . There is bibasilar atelectasis but no pleural effusion , focal consolidation , or pneumothorax .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis . Stable mild cardiomegaly .