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类癌是小肠肿瘤中最常见的肿瘤,发生率19～30%。除阑尾外,病变好发于末端回肠(占40%)。临床症状常表现为痉挛性腹痛,不完全性梗阻。较特征症状为腹泻、皮疹,这些症状出现要怀疑肝转移。实验室检查血中5-羟色胺增加,尤其是尿中-羟基吲哚醋酸根排泄增加。病理解削特点为肿瘤具有嗜铬细胞,发生于粘膜,而主要向粘膜下层、肌层,特别向浆膜层呈离心性生长发展,粘膜表面可不受累。在小肠钡餐检查方面,许多文献指出失败率可高达50%以上,有些作者认为血管造影是最可靠的方法,主要表现为肠系膜血管浸润。
Carcinoid is the most common tumor in small intestine tumors with an incidence of 19 to 30%. Except for the appendix, lesions occurred in the terminal ileum (40%). Clinical symptoms often show spastic abdominal pain, incomplete obstruction. More characteristic symptoms are diarrhea, rash, and the appearance of these symptoms is to suspect liver metastases. Laboratory tests showed an increase in serotonin in the blood, especially urinary-hydroxyindole acetate excretion. The disease is characterized by the fact that the tumor has chromaffin cells that occur in the mucosa, but mainly to the submucosa, muscle, especially to the serosal layer showed centrifugal growth and development, the mucosal surface can be immune. In the bowel barium meal examination, many literatures indicate that the failure rate can be as high as more than 50%. Some authors believe that angiography is the most reliable method, the main manifestation of mesenteric vascular infiltration.