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The small intestine is the part of the gastrointestinal tract between the stomach and the large intestine, and is where most of the digestion and absorption of food takes place. The small intestine has three distinct regions – the duodenum, jejunum, and ileum. There are countless conditions that affect the small intestine including obstructive disorders, infectious diseases, and neoplasms (cancers). There are also many developmental, congenital, or genetic conditions that affect the small intestine.
Small bowel cancer is relatively rare compared to other gastrointestinal malignancies such as gastric cancer and colorectal cancer. Several different subtypes of small intestine cancer exist. These include: adenocarcinoma, gastrointestinal stromal tumor, lymphoma, and carcinoid tumor.