Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is mildly enlarged . The mediastinal and hilar contours are unchanged , with the aorta appearing mildly tortuous . The pulmonary vascularity is not engorged . Streaky bibasilar airspace opacities likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities are seen .
    OUTPUT:
    
Mild bibasilar atelectasis .