Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The aorta is tortuous and appears dilated , unchanged . Heart size is mildly enlarged but stable . There is no pulmonary edema , with crowding of the bronchovascular structures noted . Streaky bibasilar opacities may reflect atelectasis . Infection is not excluded in the correct clinical setting . No pleural effusion or pneumothorax is identified . Multilevel degenerative changes are noted in the imaged thoracolumbar spine .
    OUTPUT:
    
Low lung volumes . Patchy bibasilar airspace opacities likely reflect atelectasis though infection can not be excluded in the correct clinical setting .