Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 17 : 14 is submitted .
    OUTPUT:
    
Interval removal of the left chest tube . The right internal jugular central line remains in place and is unchanged in position . There is a tiny left apical pneumothorax . Lung volumes are low with crowding of the pulmonary vasculature and bibasilar opacities favoring atelectasis . There are likely small layering effusions , left greater than right . Status post median sternotomy for CABG with stable postoperative cardiac and mediastinal contours .