Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a right central venous line which terminates in appropriate position , and there is no pneumothorax following placement . . The endotracheal tube and nasogastric tube are in stable position . There continues to be low lung volumes and bilateral severe diffuse pulmonary opacities .
    OUTPUT:
    
Interval placement of a right central venous line in appropriate position . No pneumothorax .