Gastric bypass

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Figure 1. Diagram of gastric bypass anatomy shows a small gastric pouch (GP) created with stapling (dotted line) of the stomach; anastomosis of the pouch to a Roux-en-Y limb (straight thick black arrows); route of gastric contents to the efferent loop (white arrows); oversewn jejunal loop (curved arrow), or blind loop, of the Roux-en-Y limb; and jejunojejunal anastomosis (thin black arrows).[1]

Lap band should be oriented approx 4-58 degrees from the vertical. (

Figure 1[1]
Lap Band
Gastric Bypass

Roux-en-Y Esophagojejunostomy[2]
Roux-en-Y Gastrojejunostomy[2]
Billroth II[2]

Gastrogastric Fistula
Gastrogastric Fistula


  1. 1.0 1.1 Jinxing Yu, Mary Ann Turner, Shao-Ro Cho, Ann S. Fulcher, Eric J. DeMaria, John M. Kellum, and Harvey J. Sugerman. Normal Anatomy and Complications after Gastric Bypass Surgery: Helical CT Findings Radiology 2004; 231: 753-760.
  2. 2.0 2.1 2.2 The Johns Hopkins University