Duodenum Inversum

Duodenum inversum, also known as duodenum reflexum, is a variation of the duodenal sweep in which the distal duodenum ascends to the right of the spine to the level of the duodenal bulb and then crosses the spine horizontally behind the superior mesenteric artery. The duodenojejunal junction is appropriately located at the "ligament" of Treitz.

Duodenum inversum may be associated with delayed gastric emptying, but is not associated with midgut volvulus.

References

• Childress MH. Duodenum inversum. J Natl Med Assoc. 1979 May;71(5):515-6.
• Long FR, Kramer SS, Markowitz RI, Taylor GE, Liacouras CA. Intestinal malrotation in children: tutorial on radiographic diagnosis in difficult cases. Radiology. 1996 Mar;198(3):775-80.
• Rozek EC, Graney CM. Duodenum inversum; a report of two cases. Radiology. 1951 Jul;57(1):66-9.