Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes which results in bronchovascular crowding . Small left - sided pleural effusion and bibasilar atelectasis are stable . No pneumothorax . Stable cardiomediastinal silhouette . Right - sided PICC line ends in the right atrium , and should be pulled back 3 cm for positioning at the cavoatrial junction .
    OUTPUT:
    
Right - sided PICC line ends in the right atrium , and should be pulled back 3 cm for positioning at the cavoatrial junction .