Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is top normal . Mediastinal contours are unremarkable . There is crowding of the bronchovascular structures with no overt pulmonary edema noted . Streaky bibasilar airspace opacities are more apparent within the left lung base , likely reflective of atelectasis . Infection can not be completely excluded . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with bibasilar streaky opacities likely reflective of atelectasis . Infection can not be excluded .