Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph was provided . A new aortic stent graft for an aneurysm is present . Curvilinear calcifications to the left of the graft represent the known aneurysm . A right internal jugular central line terminates in the mid SVC . An epidural catheter is noted . Lung volumes are low . Bibasilar atelectasis is present . There is no focal consolidation , pleural effusion or pneumothorax . The cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Bibasilar atelectasis . Postoperative changes as described above .