Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates bibasilar atelectasis , significantly increased from the prior study . There are low lung volumes which results in bronchovascular crowding . Tracheostomy tube is 5 .2 cm from the carina . A right - sided PICC line ends at the cavoatrial junction . Single - lead pacemaker is in unchanged position . A VP shunt projects over the left hemithorax .
    OUTPUT:
    
Interval increase in bibasilar atelectasis .