Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . A tracheostomy tube is in place with with an overlying oxygen mask . The lung volumes are quite low . Bibasilar opacities are seen most suggestive of atelectasis versus scarring at the right lung base and atelectasis and probable small effusion on the left . The possibility of a superimposed pneumonia is difficult to exclude . The mid to upper lungs appear well aerated . Heart size appears grossly stable . The mediastinal contour is unchanged . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Bibasilar atelectasis with probable small left effusion . Tracheostomy tube noted .