Intussusception of the mid-jejunum after small intestinal bypass operation for obesity: case report.

Invagination of the defunctionalized small intestine after jejunoileal bypass operation for morbid obesity is a serious but rare complication since the introduction of Wills' technique. The possibility, however, still exists of mechanical obstruction of other parts of the defunctionalized small intestine. This occurred in a 25-yr-old man on several occasions during an interval of 1 to 3 yr after the primary operation.