Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest ___ at 11 : 16 are submitted .
    OUTPUT:
    
There is a stable layering small to moderate left pleural effusion with associated retrocardiac airspace opacity likely reflecting partial lower lobe atelectasis . There is also possibly a small right effusion . There is likely patchy atelectasis at the right medial lung base as well . No pulmonary edema or pneumothorax . Overall cardiac and mediastinal contours are likely unchanged status post median sternotomy . No pneumothorax .