口腔白斑及扁平苔癣都是常见的口腔粘膜病。粘膜白斑已被世界卫生组织确定为癌前病变,粘膜扁平苔癣恶变的报导亦较其它粘膜病为高。这两种疾病在某些情况下,对其临床性质的判断,可能会发生疑问或混淆。因此,为了进一步探讨其发病机理,有必要对其病理组织的超微结构进行研究。本文对9例口腔粘膜白斑,7例口腔扁平苔癣的活检标本进行了光镜和电镜的组织学观 Oral leukoplakia and lichen planus are common oral mucosal diseases. Leukoplakia has been identified as a precancerous lesion by the World Health Organization. Reports of malignancy of mucosal lichen planus are also higher than other mucosal diseases. In some cases, the two diseases may be questioned or confused about their clinical properties. Therefore, in order to further explore its pathogenesis, it is necessary to study the ultrastructure of its pathological tissue. The histology of light microscopy and electron microscopy of 9 cases of oral leukoplakia and 7 cases of oral lichen planus