Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The heart size remains mildly enlarged but stable . Aortic valvular calcifications are severe . There is no pulmonary vascular congestion . Elevation of the right hemidiaphragm is chronic . Mild bibasilar atelectasis is seen , but no focal consolidation is present . There is diffuse calcification of the thoracic aorta . Mediastinal and hilar contours are unremarkable . No pleural effusion or pneumothorax is present . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No radiographic evidence for pneumonia .