Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes . The patient is status post median sternotomy and CABG . The sternotomy wires appear intact and in appropriate alignment . The right pleural effusion has decreased in size , and the left pleural effusion has increased in size , however both are small . Bibasilar atelectasis has improved . Heart size is stable . The pulmonary vasculature is normal . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Decreased small right pleural effusion . 2 . Increased small left pleural effusion . 3 . Improving bibasilar atelectasis