Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . VP shunt tubing crosses the right neck and hemi thorax . Port - A - Cath again seen residing over the right chest wall with catheter tip in the low SVC . Lung volumes are low with bibasilar atelectasis . No pneumothorax or large effusion . No overt edema . Difficult to exclude mild congestion . Heart size can not be readily assessed . Mediastinal contour is normal . Bony structures are intact .
    OUTPUT:
    
Basilar atelectasis . No pneumothorax .