小肠恶性肿瘤少见 ,十二指肠是其好发部位 ,由于其临床表现无特异性 ,早期较易误诊或漏诊 ,因而影响治疗及预后。为了进一步了解该肿瘤的特点 ,笔者就淮阴市二院近 2 5年来诊治的十二指肠原发性恶性肿瘤 12例临床分析如下。1　材料与方法笔者在市二院 1975年至 1999年六万余例 Malignant small intestinal tumor, duodenum is its predilection site, because of its non-specific clinical manifestations, early misdiagnosis or missed diagnosis, thus affecting the treatment and prognosis. In order to further understand the characteristics of the tumor, the author of Huaiyin City Hospital nearly 25 years of diagnosis and treatment of 12 cases of primary malignant tumor of the duodenum clinical analysis is as follows. 1 Materials and Methods I author in the city hospital from 1975 to 1999 more than 60,000 cases