Presented to the emergency with severe abdominal pain and vomiting of two days duration. No past medical history of peptic ulcer disease.
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A frontal erect chest x-ray showing free air under the diaphragm.
Pneumoperitoneum is defined as the presence of air in the peritoneal cavity. The most common cause is due to hollow viscus perforation . An erect chest radiograph is the most sensitive radiograph in detecting free intra-peritoneal air.