Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged . Mediastinal and hilar contours are unremarkable . The pulmonary vascularity is not engorged . There is no focal consolidation , pleural effusion or pneumothorax . There is minimal atelectasis in the lung bases . There are multiple old remote bilateral rib fractures . Mild loss of height of multiple thoracic vertebral bodies is present with diffuse demineralization , similar to the prior study .
    OUTPUT:
    
Mild bibasilar atelectasis .