Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 07 :52 is submitted .
    OUTPUT:
    
Tubes and lines are unchanged in position . Status post median sternotomy for CABG with stable postoperative cardiac and mediastinal contours . Increasing retrocardiac consolidation in the setting of a layering effusion likely reflecting compressive lower lobe atelectasis . Pneumonia can not be entirely excluded . No evidence of pulmonary edema . Interval development of patchy opacity at the right lung base favoring atelectasis . No obvious pneumothorax .