Retrograde intussusception of the bypassed duodenojejunal segment after Roux-en-Y gastrectomy: computed tomography findings.

The authors report the first documented case of retrograde enteroenteric intussusception after a Roux-en-Y gastrectomy. Computed tomography demonstrated intussusception and gangrene of the bowel, in which the intussuscipiens was the afferent loop of the duodenojejunal segment and the intussusceptum was the efferent loop of the jejunum after bypass surgery.