Cancer of the Small Intestine
Cancerous tumors in the small intestine are very uncommon, occurring in fewer than 2 of 100,000 people in the United States each year. Adenocarcinoma is the most common type of cancer of the small intestine. Adenocarcinomas develop in the glandular cells of the lining of the small intestine. People with Crohn's disease of the small intestine are more likely than others to develop adenocarcinoma.
 See the sidebar Rare Types of Small-Intestinal Cancer.
Symptoms and Diagnosis
Adenocarcinoma may produce bleeding into the intestine, which shows up as blood in the stool, and obstruction, which in turn may lead to crampy abdominal pain, expansion (distention) of the abdomen, and vomiting.
A doctor may use an endoscope (a flexible viewing tube) passed through the mouth and down to the duodenum and part of the jejunum (the upper section of the small intestine) to locate the tumor and perform a biopsy (remove a tissue sample for examination under a microscope). A doctor can sometimes see tumors of the ileum (the lower section of the small intestine) by passing a colonoscope (an endoscope used to view the lower part of the digestive tract) through the anus, through the entire large intestine, and up into the ileum. A barium x-ray can show the entire small intestine and may be used to outline the tumor. Arteriography (an x-ray taken after a radiopaque dye is injected into an artery) of intestinal arteries may be performed, especially if the tumor is bleeding. Similarly, radioactive technetium can be injected into the artery and observed on x-rays as it leaks into the intestine; this procedure helps locate sites where the tumor is bleeding. The bleeding can then be corrected surgically. Sometimes exploratory surgery is needed to identify a tumor in the small intestine.
Treatment
The best treatment for all types of cancerous growths is surgical removal of the tumor. Chemotherapy and radiation therapy after surgery do not lengthen survival time.
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