Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left PICC line is malpositioned , terminating within the right brachiocephalic vein . The linear opacities within the left midlung likely represent atelectasis , although the previously visualized bibasilar atelectasis has significantly improved . There is mild vascular congestion , but no frank pulmonary edema . The cardiac silhouette is enlarged but stable . There are no large pleural effusions . There is no pneumothorax .
    OUTPUT:
    
1 . Malpositioned left PICC line within the right brachiocephalic vein . 2 . Mild vascular congestion . 3 . Improved bibasilar atelectasis .