Segmental dilatation of the ileum in a healthy adolescent.

Segmental intestinal dilatation is a rare entity presenting overwhelmingly in infants and young children with congenital malformations, anemia, or history of gastrointestinal pathology, characterized by a focally distended segment of bowel with abrupt transition points without an obstructing barrier. We present a 16-year-old girl with no significant medical history who presented with bowel obstruction clinically. Segmental dilatation of the ileum was evident on a CT scan and small bowel series. Following surgical resection, pathologic examination of the segment revealed the presence of heterotopic gastric mucosa. The girl's symptoms resolved after surgery. Awareness of the imaging presentation of this entity can inform the evaluation of older children with nonspecific symptoms mimicking bowel obstruction.