环纹发病

定义 英文原文（暂无中文）

A rare isolated, benign hair shaft abnormality, usually presenting after the age of 2 and affecting the hair of the scalp or, very rarely, beard, axillary, or pubic hair. Hair is characterized by a banded or speckled appearance due to alternating light bands (corresponding to air-filled cavities within the cortex of the affected hair shafts) and dark bands. The bands have a lifelong duration, may only be detectable under light microscopy, are more apparent in fair-colored hair or with age-related graying, and have no effect on hair growth or fragility in the vast majority of cases.

别名

环状发

基本事实

遗传方式

常染色体显性、不适用

发病年龄

儿童期

临床表型 2

外部标识与链接