Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are low with bibasilar atelectasis again noted . Difficult to exclude a superimposed pneumonia . No large effusion or pneumothorax . Heart size appears grossly unchanged . Mediastinal contour is normal . Bony structures are intact . No free air seen below the right hemidiaphragm .
    OUTPUT:
    
Bibasilar atelectasis , difficult to exclude a subtle superimposed pneumonia .