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The duodenum is a short portion of the small intestine connecting it to the stomach. It is about 10 inches (25 cm) long, while the entire small intestine measures about 20 feet (6.5 meters).
Duodenal conditions: Introduction. Any conditions that affects the duodenum. The duodenum is a part of the digestive system. It is the first portion of the small intestine and connects the stomach to the rest of the digestive system. Some of the conditions that can affect the duodenum are ulcers, duodenitis and pyloric stenosis.