Megacolon: constipation or volvulus?

Pediatric abdominal complaints are common presentations in emergency departments, and emergency physicians are challenged every day with a vast array of gastrointestinal disorders. Differentiating the child with a benign abdominal process from the child with a more serious condition can be difficult. We report a case of massive dilatation of the colon due to fecal impaction. Means for distinguishing constipation from alternative diagnoses are discussed.