Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities persist and may reflect atelectasis and small effusions . However , in the appropriate clinical circumstance , pneumonia can not be excluded . Overall , aeration of the lungs appears stable . No pulmonary edema is evident . Cardiomediastinal and hilar contours are within normal limits and unchanged from most recent prior . Median sternotomy wires appear intact .
    OUTPUT:
    
Persistent bibasilar opacities , likely atelectasis with effusions , however , pneumonia can not be excluded in the appropriate clinical circumstance .