Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Dual lead left - sided pacer device is stable in position . Patient is status post median sternotomy . There is a small left pleural effusion with overlying atelectasis . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Small left pleural effusions with overlying atelectasis . Persistent cardiomegaly .