Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly tortuous and diffusely calcified . The pulmonary vasculature is not engorged . The mediastinal and hilar contours are unchanged . Streaky and linear opacities in both lung bases likely reflect atelectasis . No pleural effusion or pneumothorax is seen . No acute osseous abnormality is identified .
    OUTPUT:
    
Bibasilar streaky and linear opacities likely reflect atelectasis .