Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 15 :51 is submitted .
    OUTPUT:
    
Overall cardiac and mediastinal contours are stable . Tracheostomy tube and right subclavian PICC line remain unchanged in position . There is a left chest tube in place . A very tiny left apical pneumothorax is now seen which is smaller than that seen on the prior study of ___ at 16 : 23 . There are small layering effusions with patchy bibasilar consolidation , left greater the right , most likely representing compressive lower lobe atelectasis .