Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is within normal limits . The mediastinal and hilar contours are normal . The pulmonary vascularity is not engorged . Streaky bibasilar airspace opacities likely reflect atelectasis . There is no pleural effusion or pneumothorax . No acute osseous abnormality is identified . Calcified vessels are seen within the left upper abdomen .
    OUTPUT:
    
Mild bibasilar atelectasis .