Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . Right - sided Port - A - Cath tip terminates in the right atrium . Lung volumes are low . This accentuates the cardiac silhouette size which is likely mildly enlarged . Calcified mediastinal nodes are re - demonstrated reflective of prior granulomatous disease . Mediastinal and hilar contours are otherwise unremarkable . There is no pulmonary vascular congestion . Patchy bibasilar airspace opacities most likely reflect atelectasis . There is no pleural effusion or pneumothorax . No acute osseous abnormalities detected .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .