Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Lung volumes are low . Port - A - Cath resides over the right chest wall with catheter tip extending to the region of the low SVC . The cardiomediastinal silhouette is stable . There is basilar atelectasis more pronounced on the left . No definite evidence for pneumonia or CHF . No large effusion or pneumothorax . The imaged bony structures appear intact .
    OUTPUT:
    
Bibasilar atelectasis without definite signs of pneumonia .