类癌(carcinoid)是一组潜在恶性或低度恶性的肿瘤。好发于胃肠道。也可见于呼吸道、胆道、胰腺、胸腺、性腺、宫颈、皮肤以及畸胎瘤中等处。此瘤来自肠嗜铬细胞,神经嵴源性,但具有上皮性恶性肿瘤的某些病理和临床特征,故名。胞浆内大多含亲银(argentaffin,病理界原译“嗜银”)或嗜银(argyrophil,原译“亲银”)颗粒。电镜下均可查见神经分泌颗 Carcinoids are a group of potentially malignant or low-grade tumors. Occurs in the gastrointestinal tract. Also found in the respiratory tract, biliary tract, pancreas, thymus, gonads, cervix, skin, and teratoma. This tumor originates from the intestinal chromaffin cells and is neurogenic, but has some pathological and clinical features of epithelial malignancy, hence the name. The cytoplasm contains mostly argentaffin (argentaffin, originally translated by the pathological community) or argyrophil (originally translated “pro-silver”) particles. Electron microscope can see the secretory particles