Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Patchy bibasilar atelectasis is present . No focal consolidation , pleural effusion or pneumothorax is present . There is no free air detected under the diaphragms .
    OUTPUT:
    
Bibasilar atelectasis . No subdiaphragmatic free air identified .