先天性外胚叶性缺损症(Congenital EctodermalDefect.);为起因于外胚叶性之皮肤及其他之异常,以毛发缺损或过少,汗脂腺缺损或不全,齿牙之缺损或发育不良,鞍鼻,爪甲之变形等为主征之疾患。本症自1883年美国齿科医师 Guilford 开始报告以来,在皮肤科范围固不待言,亦为小儿科,齿科或外科等范围之先性异常症,已由专门医家曾作多数之报告例。 Congenital ectodermal defect (Congenital EctodermalDefect.); Is due to the occurrence of ectodermal cutaneous and other abnormalities, the hair defect or less, khanosis or incomplete hypomagnese, tooth defects or dysplasia, Saddle nose, claws, such as deformation of the main symptoms of illness. This disease has been in the dermatology field since 1883 when the American dentist Guilford began to report. It is also a report of the majority of cases reported by specialized physicians for the first time in the pediatric, dental or surgical fields.