Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . A right arm PICC line tip extends deep into the right atrium , tip not clearly visualized . Recommend retraction by at least 9 cm . Lungs are clear . There is mild bibasilar atelectasis . No pneumothorax . Cardiomediastinal silhouette is stable .
    OUTPUT:
    
PICC line tip likely residing in the right atrium . Retraction by at least 9 cm is advised . No significant change from prior exam . Stable bibasilar atelectasis .