Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest radiograph was obtained . Small amount of pneumoperitoneum is expected status post abdominal surgery . Bibasilar atelectasis is mild . Bilateral pleural effusions are small . There is no consolidation or pneumothorax . Cardiac and mediastinal contours are normal . Aortic arch calcification is trace .
    OUTPUT:
    
Small pneumoperitoneum expected after abdominal surgery . Bibasilar atelectasis .