Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postsurgical changes from prior CABG with median sternotomy wires and surgical clips . Heart size is at the upper limits of normal or slightly enlarged . The postoperative cardiomediastinal silhouette and hilar contours are unremarkable . Lung volumes may be slightly . Mild bibasilar atelectasis . Lungs are otherwise grossly clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .