Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . Dual - lead right - sided pacemaker is again seen with leads extending to the expected positions of the right atrium and right ventricle , unchanged . Patient is status post median sternotomy . There is mild left base atelectasis . Slight blunting of the left costophrenic angle likely relates to overlying soft tissue , although lateral view would be helpful for confirmation . No focal consolidation or pleural effusion . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Mild left base atelectasis . Relative mild blunting of the left costophrenic angle may be related to overlying soft tissue , though lateral would be helpful to assess for possible small pleural effusion .