Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One portable semi-erect the AP view of the chest . A large pneumoperitoneum is new compared to most recent study . Probable small left pleural effusion . Widened mediastinum is stable . There is no pneumothorax . A left basilar opacification likely representing atelectasis is unchanged . Cardiac and mediastinal contours are stable . No new parenchymal opacities concerning for pneumonia .
    OUTPUT:
    
1 . New large pneumoperitoneum . Otherwise , unchanged from prior study . No pneumothorax . These findings were discussed with Dr . ___ at 12 :45 p .m . on ___ by telephone .