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Cancers originating in the small intestine usually occur in the sixth and seventh decades. The most common malignancy is carcinoid tumor followed by adenocarcinoma, lymphoma, and leiomyosarcoma. The small intestine ranks second only lo the appendix as ihe most common site of carcinoid tumors. Only 25% to 30% of these carcinoid tumors arc symptomatic. Adenocarcinoma [...]

Incidence figures vary from 7% to 75% of the population > 50 yr. increasing with age and peaking in the seventh decade. Most benign tumors are polyps (a clinical term without pathologic significance that refers to any mass of tissue arising from a mucosal surface and protruding into the lumen). The relationship of colonic polyps [...]