Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Port - A - Cath tip again seen residing in the low SVC or cavoatrial junction . Lung volumes are markedly low . Allowing for low lung volumes , there is no overt evidence for pneumonia , CHF , large effusion or pneumothorax . There is presumably left basilar In the setting of low lung volumes , basilar atelectasis is likely present . The heart size can not be assessed . The mediastinal contour is stable . Bony structures appear intact .
    OUTPUT:
    
Limited study due to low lung volumes with no overt abnormalities . Port - A - Cath tip unchanged in the low SVC / cavoatrial junction .