Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy , CABG , and vascular stenting . The heart size is top normal . The mediastinal contour is unchanged with mild aortic tortuosity . Again noted is a large left hiatal hernia , with associated opacity in the left lung base likely reflecting atelectasis . No large pleural effusion or pneumothorax is present . Ill - defined patchy opacities within the right lung base and both mid lung fields appear more pronounced when compared to the prior study , and may reflect areas of developing infection , or possibly asymmetric pulmonary edema . No pneumothorax is identified . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
1 . Patchy ill - defined opacities within the mid lung fields bilaterally and right lung base , which could represent areas of infection or asymmetric pulmonary edema . 2 . Large hiatal hernia with adjacent left basilar opacity likely reflecting atelectasis .