Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided PICC line is unchanged in position , just entering the right atrium . Aeration in the right upper lobe and at the left lung base has improved , suggesting improved atelectasis . There is no pneumothorax . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
Unchanged position of right PICC line , which may be withdrawn by approximately 2 cm for more optimal positioning at the superior cavoatrial junction . Improving left basilar atelectasis .