Retrograde jejunogastric intussusception.

Retrograde gastrointestinal intussusception is a rare entity, most commonly reported after gastric resection and gastrojejunostomy. Its occurrence in the absence of previous gastric resection is extremely unusual, with only four cases reported. All cases were associated with previously placed gastrostomy tubes and implicated these as the inciting factor. We present a fifth case and review the literature. The mechanism of this phenomenon is described and recommendations to prevent this potentially fatal complication are made.