A 16-year-old boy presented to the emergency department with severe, diffuse, continuous abdominal pain for 2 days. There was no history of fever or vomiting. His last bowel motion was 2 days back. He was seen at an outside hospital the previous day, diagnosed as having constipation, and prescribed stool softener (Metamucil; Procter & Gamble, Cincinnati, Ohio) that did not result in any relief. There was no significant past or family history. On examination, his vital signs were normal. His abdomen showed mild diffuse tenderness, but no rigidity. There was no mass. Bowel sounds were present. A radiograph of the abdomen (Figure 1) was obtained. A therapeutic procedure in the emergency department resulted in alleviation of pain. The patient was admitted to the hospital for observation, where pain recurred the next day, when a barium enema (Figure 2and Figure 3) was used to confirm the diagnosis.