在涎腺和乳腺的瘤样增生里,肌上皮细胞并非罕见。但是,当瘤组织中梭形细胞数量很多时,常常会忽略是真正上皮细胞而做出不适当诊断。本文报告一例腭部小涎腺多形性腺瘤,光镜下仅表现出是一种梭形细胞为主的软组织肿瘤,后经电镜证实这些梭形细胞为具有上皮和平滑肌两种性质的典型的肌上皮细胞。 In salivary and breast tumor-like hyperplasia, myoepithelial cells are not uncommon. However, when there is a large number of spindle cells in the tumor tissue, it is often overlooked as making true epithelial cells that make inappropriate diagnoses. This article reports a case of palatal small salivary gland pleomorphic adenoma, showing only a spindle cell-based soft tissue tumor under light microscopy, confirmed by electron microscopy of these spindle cells with epithelial and smooth muscle of the two properties of the typical Myoepithelial cells.