Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . A left chest wall AICD device is demonstrated with leads terminating in the right atrium and right ventricle , as before . An abandoned lead is the identified over the right superior hemi thorax unchanged in position . The cardiac silhouette is mildly enlarged but stable in size from ___ . The pulmonary vasculature is prominent however there is no evidence pulmonary edema . Lung volumes are low . There is slightly increased opacity at the base of the left lung which may represent atelectasis or infection in the appropriate clinical setting . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Subtle opacity at the base of the left lung likely represents atelectasis . Mild prominence of the pulmonary vasculature without frank pulmonary edema .