Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Patchy left base opacity is re- demonstrated , similar on the frontal view and has been present since at least ___ , however , finding may be slightly increased on the lateral view and underlying atelectasis or subtle superimposed consolidation not excluded . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Patchy left base opacity is re- demonstrated , similar on the frontal view and has been present since at least ___ , however , finding may be slightly increased on the lateral view and underlying atelectasis or subtle superimposed consolidation not excluded .