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A 54-year-old woman comes to the emergency department because of a 5-hour history of diffuse, severe abdominal pain, nausea, and vomiting. She reports that there is no blood or bile in the vomitus. Two weeks ago, she started having mild aching epigastric pain, which improved with eating. Since then, she has gained 1.4 kg (3 lb). She has a 2-year history of osteoarthritis of both knees, for which she takes ibuprofen. She drinks 1–2 glasses of wine daily. She is lying supine with her knees drawn up and avoids any movement. Her temperature is 38.5°C (101.3°F), pulse is 112/min, respirations are 20/min, and blood pressure is 115/70 mm Hg. Physical examination shows abdominal tenderness and guarding; bowel sounds are decreased. An x-ray of the chest is shown. Which of the following is the most likely cause of this patient's current symptoms? A - Perforated peptic ulcer B - Acute pancreatitis C - Acute mesenteric ischemia D - Gastric cancer E - Gastroesophageal reflux disease F - Cholecystolithiasis