Abstract
In a series of ninety-four patients with proved perforated duodenal ulcer x-ray evidence of pneumoperitoneum was present in 66 per cent and absent in 34 per cent. The time interval between onset of symptoms and x-ray examination had no demonstrable effect on the presence or absence of free peritoneal air. The size of the perforation in the duodenal wall was not significantly different in patients with or without pneumoperitoneum. The demonstration of pneumoperitoneum in an atypical case of suspected perforated duodenal ulcer is an extremely helpful diagnostic aid; absence of pneumoperitoneum in such a case is of relatively little diagnostic significance.
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