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小肠原发性恶性肿瘤是指从十二指肠起至回盲瓣止的肠管所发生的原发性恶性肿瘤。 一般概况 发病率:小肠占全部胃肠道长度的70～80％,但小肠恶性肿瘤仅占胃肠道的0.8％～8％,占全身恶性肿瘤的0.2～0.3％,其中空肠肿瘤约占30％。小肠恶性肿瘤的发病率远较食管、结肠及直肠为低。 年龄和性别:平均为56岁左右,男略多于女。 分类和分布:按组织来源,来自上皮腺体者为腺癌;来自肠腺内的嗜银细胞或嗜铬细胞者为类癌;来自平滑肌者为平滑肌肉瘤;来自类淋巴组织者则为恶性淋巴瘤;其它较少见的来自结缔组织、神经
The primary malignant tumor of the small intestine refers to a primary malignant tumor that occurs in the intestine from the duodenum to the ileocecal valve. General morbidity: The small intestine accounts for 70 to 80% of the total length of the gastrointestinal tract, but the small intestine malignancy only accounts for 0.8% to 8% of the gastrointestinal tract, accounting for 0.2 to 0.3% of the total body malignancy, of which jejunal tumors account for about 30. %. The incidence of malignant tumors in the small intestine is much lower than that in the esophagus, colon, and rectum. Age and sex: The average is about 56 years old, slightly more than men. Classification and distribution: According to the tissue source, the adenocarcinoma from the epithelial gland is adenocarcinoma; the argyophils or chromaffin cells from the intestinal gland are carcinoid; the leiomyosarcoma from smooth muscle; the lymphatic from lymphoid tissue. Tumor; other less common from connective tissue, nerves