2例均为男性,年龄分别为54岁和66岁,均因左侧腮腺肿物入院。肿瘤直径分别为1.5cm和3cm,行左腮腺肿物切除术。透射电镜观察肿瘤上皮细胞的胞浆极为丰富。内层高柱状上皮,线粒体增生肥大,呈圆形、卵圆形或相互挤压呈不规则形,有时充满整个细胞的胞浆中,排列紧密,线粒体的嵴呈多层形态,长短不 Both cases were male and were 54 and 66 years old, respectively, and were admitted to the hospital because of left parotid masses. The tumor diameters were 1.5 cm and 3 cm, respectively, and left hepatoid tumor resection was performed. Transmission electron microscopy showed that the cytoplasm of tumor epithelial cells was extremely abundant. The inner columnar epithelium has hypertrophic mitochondria. It is round, oval or squeezing to an irregular shape. It is sometimes filled with the cytoplasm of the whole cell and is closely packed. The mitochondrial ridge is multi-layered and its length is not.