Duodenal Carcinoid. The tip of this small sessile lesion suggest an early ulceration that is typical for this tumor. In the duodenum, a small submucosal nodule located in the duodenal bulb is typical. In the Ileum , they are generally larger and may ulcerate. Most common in middle-aged patients. Duodenal carcinoids may cause obstruction or symptoms due to peptide secretion. Distal small bowel carcinoids cause obstructive symptoms such as abdominal pain, vomiting due to kinking from mesenteric involvement. Ulcerated ileal carcinoids cause acute, episodic, or occult gastrointestinal bleeding.
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