Duodenal ulcer perforation, pneumoperitoneum.
This erect chest X-ray shows a large volume of free air in the peritoneal cavity in a patient with a duodenal ulcer perforation. The presence of a pneumoperitoneum and the volume of air that accumulates depend on how quickly the ulcer seals off spontaneously . The line depicted by the arrowheads consists of visceral pleura, parietal pleura, diaphragm and parietal peritoneum.
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