Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left central venous catheter does not appear follow the course into the superior vena cava , remaining on the left side of the mediastinum . The lungs are clear without focal opacity , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
Left central venous line does not follow the expected course of the superior vena cava . Placement can not be confirmed on this radiograph . Further evaluation with a lateral radiograph is recommended .