A 4 year-old boy presented with sudden, intense, and constant abdominal pain that awoke him from sleep. He had experienced no nausea or vomiting, and stooling had been regular. Vital signs were blood pressure: 133/87, heart rate: 120, respiratory rate: 28, SaO2: 99%, and temperature: 35.7. On physical exam the patient was writhing in pain with a mildly distended abdomen, with bowel sounds prese...
