Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are reduced . Heart size is borderline enlarged . The aorta is mildly tortuous . There is crowding of the bronchovascular structures with mild pulmonary vascular congestion . Patchy opacities in lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . No acute osseous abnormalities seen . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild pulmonary vascular congestion and bibasilar atelectasis in the setting of low lung volumes .