Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy tube is in unchanged position . There are low lung volumes . The heart size is mildly enlarged , but stable . The aorta remains diffusely tortuous . There is crowding of the bronchovascular structures but no overt pulmonary edema is present . Persistent bibasilar airspace opacities are again noted , likely reflective of atelectasis but infection can not be is fully excluded . No pleural effusion or pneumothorax is detected . Left PICC tip terminates in the SVC .
    OUTPUT:
    
Low lung volumes with bibasilar airspace opacities , likely reflecting atelectasis but infection or aspiration can not be excluded .