Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are persistently low . Heart size is accentuated as result with mild to moderate enlargement , similar to that seen previously . Mediastinal and hilar contours are unremarkable . Crowding of the bronchovascular structures is present without overt pulmonary edema . Patchy opacities in the lung bases may reflect areas of atelectasis in the setting of low lung volumes , and do not appear substantially changed in the interval . No pleural effusion or pneumothorax is present . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .