Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post CABG . An aortic valve replacement is unchanged in position . There is a moderate hiatal hernia . Mild cardiomegaly is unchanged . There is mild pulmonary vascular congestion which appears chronic with worsening patchy bibasilar opacities , likely reflecting atelectasis . There is no pleural effusion or pneumothorax . Clips are noted in the right upper quadrant from prior cholecystectomy .
    OUTPUT:
    
1 . Mild pulmonary vascular congestion appears chronic . 2 . Mild increase of patchy bibasilar opacities , which likely represent atelectasis .