Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Nerve stimulator device projects over the left mid hemithorax with a single lead coursing cephalad into the neck . Heart size remains mildly enlarged . Mediastinal and hilar contours are unremarkable . Streaky retrocardiac opacity may reflect atelectasis but infection is not excluded . No pleural effusion or pneumothorax is present . There is no pulmonary vascular congestion . Remote right mid clavicular fracture is re - demonstrated .
    OUTPUT:
    
Streaky retrocardiac opacity could reflect atelectasis but infection can not be completely excluded .