
A 14-year-old is referred to your emergency department for evaluation of recurrent episodes of abdominal pain. Over the past year he has had five such episodes, separated by symptom-free intervals of about two months. The pain has been consistently periumbilical, without radiation or localization, and each of the five instances of pain has been associated with a bifrontal headache. The last episode before the present one, two months ago, was the first associated with fever.
