Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Lung volumes remain low . Heart size is normal . The mediastinal and hilar contours are unchanged with mild widening of the right paratracheal stripe suggestive of underlying lymphadenopathy , as seen previously . Pulmonary vasculature is not engorged . There are continued ill - defined patchy opacities within the left lung base as well as within the right upper and mid lung fields , reflective of chronic changes . Slightly increased patchy opacification in the retrocardiac region could reflect superimposed left lower lobe atelectasis , but infection is not excluded . No large pleural effusion or pneumothorax is demonstrated .
    OUTPUT:
    
Continued chronic changes within the right upper and mid lung fields as well the left lung base . Slightly increased opacification in the retrocardiac region could reflect worsening left lower lobe atelectasis though infection can not be completely excluded .