Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . Mediastinal and hilar contours are unremarkable . Minimal patchy opacity is noted in the lung bases , likely atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormality is detected .
    OUTPUT:
    
Minimal bibasilar atelectasis .