Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest demonstrates interval retraction of a right internal jugular approach central venous catheter , now with tip at the cavoatrial junction . The cardiomediastinal silhouette is within normal limits allowing for low lung volumes . There is no pneumothorax or pleural effusion . Previously seen perihilar vascular congestion has improved in the interim . There may be trace retrocardiac subsegmental atelectasis .
    OUTPUT:
    
1 . Central line in appropriate location , without pneumothorax . 2 . Interval improvement of perihilar vascular congestion .