Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains top normal . The mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . Minimal patchy opacities are noted in the lung bases , likely reflective of atelectasis . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Minimal bibasilar atelectasis .