Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is left basilar atelectasis . Lungs are otherwise clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Note is made of multiple severe compression deformities in the mid to lower thoracic spine . Vertebroplasty changes are noted at T11 .
    OUTPUT:
    
Left basilar atelectasis . Multiple severe mid to lower thoracic vertebral body compression deformities without obvious change since prior CT from 3 days prior .