单语范例（未经PONS编辑处理）
It starts at the duodenal bulb and ends at the suspensory muscle of duodenum.
en.wikipedia.org Bile can enter the vomit during subsequent heaves due to duodenal contraction if the vomiting is severe.
en.wikipedia.org Endoscopy is essential in ruling out other causes of upper gastrointestinal bleeding and in rare cases; active bleeding can be seen from the duodenal ampulla.
en.wikipedia.org The definitive treatment for duodenal atresia is surgery (duodenoduodenostomy), which may be performed openly or laparoscopically.
en.wikipedia.org This is where sections of the pancreas completely encircle the duodenum, and may even lead to duodenal atresia.
en.wikipedia.org