Roux-en-Y gastric bypass procedure
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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.
Illustrations of the two pathways for the Roux limb used in the laparoscopic Roux-en-Y gastric bypass procedure.
Knowledge of the path is critical to an accurate interpretation of subsequent radiographs.