Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is normal . The aorta is tortuous and diffusely calcified . While there is crowding of the bronchovascular structures , more focal patchy opacities at the lung bases may reflect atelectasis though infection or aspiration can not be excluded . There is no pulmonary vascular congestion . No pleural effusion or pneumothorax is identified . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Low lung volumes . Patchy opacities at the lung bases could reflect atelectasis though infection or aspiration can not be excluded .