A five-year-old child presented with concerns about the one-day history of abdominal discomfort. The girl had managed to spend the day in school but seemed to have worsened since coming home and had been sick once or twice. There was no apparent fever, diarrhea, rash, pain elsewhere, photophobia or altered behavior, or dysuria, and some simple painkillers had made very little difference. No other family member was currently unwell with any gastrointestinal conditions and there were no travels abroad recently, and no obvious unusual food intake in the last three days.
There was little medical history - the child was born at term, developed well, was up to date on all vaccinations, had chickenpox and a few reviews for minor illnesses. She had a mild head injury six months before, with no further consequences. There was no current medication or allergy history. The child was apparently…
