Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . Left upper quadrant clips are again noted . There is bibasilar atelectasis , slightly greater on the left than on the right . There is no definite sign of pneumonia or CHF . No large effusion or pneumothorax seen . Cardiomediastinal silhouette is stable . Bony structures are intact . There is no free air below the right hemidiaphragm .
    OUTPUT:
    
Mild bibasilar atelectasis . No definite signs of pneumonia .