原位癌系 Ewing(1928)所命名,是细胞癌变局限于其原米的部位,并具有明显癌变的形态学特征,而尚无浸润性生长的生物学特性。近30年来,随着细胞学防癌普查的广泛开展,才被确认为一类组织学改变,是各种癌早期演变所必经的阶段。原位癌发生部位原位癌一名首先应用于子宫颈,其后逐渐推广到一、子宫内膜、输卵管、阴道及外阴,二、皮肤包括 Bowen 氏病和 paget 氏病, In situ carcinoma line named Ewing (1928), is the site of canceration of cells confined to its original form and has the morphological features of significant canceration without the biological properties of invasive growth. In the recent 30 years, with the extensive investigation of cytological anti-cancer screening, it has been confirmed as a kind of histological change, and it is the necessary stage of various cancer’s early evolution. In situ carcinoma of the site of a carcinoma in situ first applied to the cervix, and then gradually extended to one, the endometrium, fallopian tube, vagina and vulva, the skin, including Bowen’s disease and paget’s disease,