Fig. 5From: Petersen hernia after open gastrectomy with Roux-en-Y reconstruction: a report of two cases and literature reviewScheme of the R-Y reconstruction. a Antecolic route; b retrocolic route. The mesenteric defect at the jejunojejunostomy (J), and the Petersen defect (P) can be seen in both the antecolic and the retrocolic routes. The defect in the transverse mesocolon through which the Roux loop passes is formed in the retrocolic route (M)Back to article page