OBSTRUCTION of the duodenum in adult life, caused by factors other than duodenal ulcer, is a rare and diagnostically intriguing situation. Partial obstruction can exist for many years, giving rise to chronic abdominal distress which is abolished with striking rapidity upon removal of the obstruction. In the following case, the duodenal obstruction was caused by an intraluminal diverticulum. Because of the dramatic x-ray findings, the unusual pathogenesis, and the happy outcome from treatment, it provided an interesting study of this uncommon condition. We have found only one other such case reported1 in the medical literature; that case resembled the following one in all respects. Report of Case The patient, a 33-year-old white man, consulted us primarily because of intermittent abdominal distress which had been present since early childhood. The patient experienced attacks of cramping, gas-like distress which occurred high in the epigastrium two to three hours after meals. Frequently,