Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Heart size appears mildly enlarged . Mediastinal and hilar contours are grossly unchanged . Crowding of bronchovascular structures is present without overt pulmonary edema . Patchy opacities in the lung bases may reflect areas of atelectasis , though infection is difficult to exclude in the correct clinical setting . No pleural effusion or pneumothorax is present . Mild multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes with patchy bibasilar airspace opacities most likely reflective of atelectasis . Infection can not be excluded in the correct clinical setting .