Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . Cardiac silhouette size is borderline enlarged . The mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Linear opacities within the lung bases are compatible with subsegmental atelectasis . Lungs are otherwise clear without focal consolidation . No pleural effusion or pneumothorax is present . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .