[Internal herniation through a mesenteric defect after Roux-en-Y anastomosis].

We report a case of entire of small bowel necrosis due to internal herniation through a mesenteric rent around the Roux-en-Y anastomosis. For prevention of internal herniation around the Roux-en-Y limb, secure closing of the mesenteric is recommended. Nevertheless, the consequences of a mesenteric closing defect are rarely reported. Necrosis of the entire small has never been described yet.