Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP radiograph was provided . Lung volumes are slightly low . There is no focal consolidation , pleural effusion or pneumothorax . There is bibasilar atelectasis , right greater than left . Right shoulder replacement hardware is present . Multiple monitoring devices overly the lungs . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Bibasilar atelectasis . No pneumothorax .