A female neonate with patent omphalomesenteric duct was treated by ductal excision. Six days following surgery, she developed vomiting and abdominal distension. On plain radiographs, distended bowel loops with multiple, air‐fluid levels consistent with an intestinal obstruction were evident. Sonography demonstrated an ileo‐ileal intussusception. At surgery, a 3‐cm, ileo‐ileal intussusception was noted proximal to the previous Lembert suture site and was manually reduced. Awareness of the possibility of small‐bowel intussusception following surgery was critical to ensuring prompt and successful treatment of this infant. © 2011 Wiley Periodicals, Inc. J Clin Ultrasound, 2011