Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is normal . The aorta is mildly tortuous . Mediastinal and hilar contours are otherwise unremarkable . There is crowding of the bronchovascular structures , but no overt pulmonary edema is demonstrated . Patchy opacities in the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . Mild dextroscoliosis of the thoracolumbar spine is demonstrated with moderate to severe multilevel degenerative changes .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .