Akoglu Gulsen, Emre Selma, Metin Ahmet, Erbil K Mine, Akpolat Demet, Firat Aysegul, Hayran Murvet
Dermatology Clinic, Ankara Ataturk Training and Research Hospital, Ankara, Turkey.
Int J Trichology. 2012 Apr;4(2):89-92. doi: 10.4103/0974-7753.96909.
Pili annulati (PA) is typically characterized by shinny beads seen along the hair shaft. PA is accepted to belong to the classification of hair shaft abnormalities without fragility. Herein, we described a 14-year-old, fair skin with dark-haired girl diagnosed as PA with fragility which was demonstrated by weathering features in electron microscopic examinations. The patient had shinny beaded, easily breakable hairs since the age of four. A few broken hairs were observed by a light pull test. Transmitted light microscopy revealed periodic dark bands in the hair shaft. These dark bands disappeared after application of 10% aqueous potassium hydroxide. Multiple cavities within hair shaft and severe cuticular damages representing the weathering pattern were observed in electron microscopic examinations. All these findings were found to be consistent with presence of fragility in PA. This case provides evidences of fragile hair structure of PA which may be due to pathological cavities within hair shafts.
竹节状发（PA）的典型特征是在毛发干上可见闪亮的珠子。PA被认为属于无脆性的发干异常分类。在此，我们描述了一名14岁、皮肤白皙、深色头发的女孩，被诊断为具有脆性的PA，这在电子显微镜检查中的风化特征中得到了证实。该患者自4岁起就有闪亮的串珠状、易折断的毛发。轻度牵拉试验观察到一些断发。透射光显微镜显示毛发干中有周期性暗带。用10%氢氧化钾水溶液处理后，这些暗带消失。电子显微镜检查观察到毛发干内有多个空洞以及代表风化模式的严重角质层损伤。所有这些发现都与PA中存在脆性一致。该病例提供了PA毛发结构脆弱的证据，这可能是由于毛发干内的病理性空洞所致。
