Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a right - sided central venous catheter whose tip is likely in the upper right atrium . Low lung volumes are again noted . There is no pneumothorax or other change from prior . Appearance of the right hilum is unchanged .
    OUTPUT:
    
New right - sided central venous catheter without pneumothorax . Right - sided central venous catheter tip in the upper right atrium and could be withdrawn 3 cm for optimal placement .