Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal chest radiograph demonstrates left PICC tip at the superior cavoatrial junction , similar in appearance to previous examination . Persistently hypoinflated lungs with vascular crowding and bibasilar atelectasis . No new focal opacity . No pleural effusion or pneumothorax . Heart size , mediastinal contour and hila are otherwise unremarkable . Limited assessment of the upper abdomen is within normal limits . Lower thoracic / upper lumbar spinal hardware is present .
    OUTPUT:
    
1 . Left PICC tip at superior cavoatrial junction , unchanged since ___ . 2 . Hypoinflated lungs with bibasilar atelectasis .