一、十二指肠肿瘤的特点（一）发病率的特点与胃、大肠等消化道肿瘤相比，小肠肿瘤少见，小肠肿瘤仅占全胃肠道肿瘤的5％～6％。原发性十二指肠肿瘤约占小肠肿瘤的1／4～1／5。自1746年，Hamburger报道首例，至今英文文献报告近千例，国内约5O0例。我院30年来诊治27例。但如按 First, the characteristics of duodenal tumor (a) the incidence of features Compared with the stomach, large intestine and other digestive tract tumors, small bowel tumors are rare, small intestine tumors account for only 5% to 6% of total gastrointestinal cancer. Primary duodenal tumors account for about 1/4 to 1/5 of small intestine tumors. Since 1746, the first case was reported by Hamburger, and nearly 1,000 cases have been reported in English literature so far, and about 5O0 cases in China. In our hospital over the past 30 years, 27 cases have been diagnosed and treated. But if you press