Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The aorta is tortuous and calcified . The mediastinal and hilar contours are unchanged . Pulmonary vascularity is not engorged . Streaky opacities in the lung bases likely reflect atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . Diffuse demineralization of the osseous structures is present with multilevel degenerative changes seen throughout the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis .