光镜研究表明粘液表皮样癌由三种基本细胞所组成,即粘液样细胞、表皮样细胞及中间细胞。比较一致地认为该瘤起源于涎腺的大导管。近年来随着电镜和免疫组织化学技术的应用,发现了肿瘤中肌上皮样细胞的存在,因而,“闰管”或“闰管-腺泡”单位起源的新学说被提出。本文详细介绍了粘液表皮样癌的临床组织学分型问题。 Light microscopic studies have shown that mucoepidermoid carcinoma consists of three basic cells, namely mucin-like cells, epidermoid cells, and intermediate cells. It is relatively consistent that this tumor originates from the large duct of the parotid gland. In recent years, with the application of electron microscopy and immunohistochemical techniques, the existence of myoepithelial cells in tumors has been discovered. Therefore, a new theory of the origin of the unit of “sacral canal” or “sacral canal-acinar” has been proposed. This article details the clinical histological classification of mucoepidermoid carcinoma.