移行性一穴肛原癌是1956年Grinvalsky & Helwig所提出的名称。这类肿瘤在组织像上好似一穴肛的胚胎残留。最近Gillespie等对三种不同组织学形态的移行性一穴肛原癌作电镜观察,证明起源于内外胚层交界处的移行上皮带,因此是一类特殊的肿瘤,此瘤不但可发生于肛管直肠交界处,亦可发生于男性或女性尿道远端。本文报告8例,4例发生于肛管4例发生于女性尿道外口,并简要复习文献。 病例和方法 1959年至1931年我院外检肛管肿瘤65 A transitional anogenital cancer is the name given by Grinvalsky & Helwig in 1956. This type of tumor resembles a hole in the anatomy of an anal embryo. Recently, Gillespie et al. performed electron microscopy on three different histological morphological transitional anal cancers. It was proved that they originated in the transitional belt at the junction of the endoderm and ectoderm. Therefore, it is a special type of tumor. This tumor can not only occur in the anal canal. The junction of the rectum can also occur in the male or female distal urethra. This article reports 8 cases, 4 cases occurred in the anal canal occurred outside the female urethral orifice, and a brief review of the literature. Cases and Methods External Anal Tumors in Our Hospital from 1959 to 1931