Peptic ulcers are four times more common in the proximal duodenum than in the stomach
Duodenal ulcers usually occur within a few centimeters of the pyloric valve (first part of duodenum) and involve the anterior duodenal wall
Gastric peptic ulcers are predominantly located along the lesser curvature near the interface of the body and antrum. Anterio, posterior wall and greater curvature are less commonly affected
Uncommon locations include – within or adjacent to meckles diverticulum
In duodenum, stomach or jejunum in patients with Zollinger-Ellison syndrome
In the margins of gastroenterostomy (stomal ulcer)