Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP upright chest radiograph demonstrates clear lungs bilaterally . Cardiomediastinal and hilar contours appear stable . A left internal jugular central venous line is identified , its tip which appears to project over the anticipated location of the superior vena cava . There is no pneumothorax . There is no pleural effusion .
    OUTPUT:
    
Status post left internal jugular central venous line . No pneumothorax .