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The Roux limb may be brought to the stomach along different paths, one is Anterocolic-Anterogastric course.
The Roux limb may be brought to the stomach along different paths, another one is retrocolic-retrogastric path, that involves tunnelling the Roux limb through a surgically created defect in the transverse mesocolon, behind the excluded stomach.
Diagram by Bruno Di Muzio.