Emergency presentation of retrograde intussusception as a late complication of gastric bypass.

Retrograde intussusception is a rare complication of a Roux-en-Y gastric bypass. With the rising number of gastric bypass operations being performed in the UK, the incidence of retrograde intussusception is likely to increase. We report the first case in the UK and highlight its insidious presentation and the importance of considering intussusception in any patient with a history of a Roux-en-Y gastric bypass.