Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . There is minimal atelectasis in the lung bases . No focal consolidation , pleural effusion or pneumothorax identified . No acute osseous abnormalities are seen . There is no free air noted under the diaphragms . A VP shunt catheter is seen coursing along the right neck and chest .
    OUTPUT:
    
Mild bibasilar atelectasis . No pneumothorax or free intraperitoneal air .