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The duodenum is the first part of the small intestine. It is located between the stomach and the middle part of the small intestine, or jejunum. After foods mix with stomach acid, they move into the duodenum, where they mix with bile from the gallbladder and digestive juices from the pancreas.
The most frequent location of the more common duodenal pseudodiverticula is along the medial wall of the second and third portions of the duodenum, usually within 2.0 cm of the ampulla of Vater (hepatopancreatic ampulla). Most patients are asymptomatic, and the diagnosis can be performed easily at CT (Fig 2).igure 18c. Duodenal paraganglioma in a 54-year-old man. (a) CT scan shows a subtle, smoothly margined soft-tissue mass (arrows) in the second and third portions of the duodenum without obstruction.