Lee S S, Lee Y S, Giam Y C
National Skin Centre and Department of Pathology, National University of Singapore, Singapore.
Pediatr Dermatol. 2001 Jan-Feb;18(1):27-30. doi: 10.1046/j.1525-1470.2001.018001027.x.
We report pseudopili annulati for the first time in a dark-haired Chinese girl. The hair was elliptical in shape and twisted along its long axis. The banded or ringed appearance was due to incident light being reflected by the flattened segments. Banding was also noted under polarized light but was not present under transmitted light. Under transmitted light the whole length of the hair appeared dark and the thickness varied at regular intervals, giving rise to fusiform segments due to the twisted nature of the hair shaft. Scanning and transmission electron microscopic examinations revealed no abnormalities in the cuticle and cortex.
我们首次在中国一名黑发女孩身上报告了环形假发。头发呈椭圆形，沿其长轴扭曲。带状或环状外观是由于入射光被扁平部分反射所致。在偏振光下也观察到了带状现象，但在透射光下则不存在。在透射光下，头发全长看起来较暗，厚度有规律地变化，由于发干的扭曲性质而形成梭形节段。扫描电子显微镜和透射电子显微镜检查显示，角质层和皮质均无异常。
