- A 60-year-old man presented with severe abdominal pain for 1 day. His examination showed a pulse of 120 bpm and diffuse abdominal guarding. A chest X-ray revealed free air under his right hemidiaphragm. - His history indicated chronic back pain treated with NSAIDs and recent worsening abdominal pain. - Based on his presentation of pneumoperitoneum, the provisional diagnosis was a perforated peptic ulcer leading to pneumoperitoneum. Peptic ulcers can be caused by H. pylori infection, NSAID use, or Zollinger-Ellison syndrome. Perforation is a complication that is usually treated with broad-spectrum antibiotics and surgery such