What is a Petersen’s Hernia after Roux-en-Y Gastric Bypass?

Petersen’s Hernia

  • A form of internal hernia (usuall through iatrogenic defects from prior surgery)
  • Can be found after Roux-en Y Gastric Bypass surgeries (a form of WLS: weight loss surgery)
  • The Petersen’s Hernia is found between the transferse colon mesentery and the mesentery of the segement of Jejunum
  • It is the herniation of intestinal loops through the defect between the small bowel limbs, the transverse mesocolon and the retroperitoneum.
  • Laparoscopic surgery is a risk factor for this type of hernia because of fewer post operative adhesions.


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