A 9-year-old girl with a history of constipation presents to the emergency department with vomiting, diarrhea, and abdominal pain. Four days ago she developed abdominal pain and frequent watery diarrhea. During the past 2 days, she has also had 5 episodes of nonbloody and nonbilious emesis, decreased appetite, and subjective fevers. Yesterday, she presented to an outside hospital and was discharged with a diagnosis of acute gastroenteritis. She denies dysuria, hematuria, or changes in urinary frequency. She has no known sick contacts and is premenarchal. She has a history of constipation and was seen in the emergency department 3 months ago with mild, intermittent abdominal pain and hard stools. She was started on a stool softener, which was discontinued after symptom improvement with soft and regular stools every 1 to 2 days. Currently, she denies hard stools and reports numerous episodes of diarrhea and abdominal pain that do not change...

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