Mathur Mahesh, Acharya Prakash, Karki Alina, Shah Jyoti, Kc Nisha
Department of Dermatology, College of Medical Sciences, Bharatpur, Nepal.
Int J Trichology. 2019 Jan-Feb;11(1):14-19. doi: 10.4103/ijt.ijt_77_18.
Hair casts have been reported in a variety of hair and scalp disorders. Trichoscopy allows a quick and noninvasive method for the evaluation of hair and scalp disorders in high magnification. However, the study of hair casts seen in trichoscopy is lacking.
The main objective is to study the occurrence and patterns of tubular hair cast (THC) in different hair and scalp disorders.
The patients with hair and scalp disorders presenting at the dermatology department of our hospital were evaluated using trichoscopy. Cases of primary parakeratotic disorders and behavioral disorders were excluded. After a detailed history and evaluation of the hair and scalp, histopathology, light microscopic examination, potassium hydroxide examination, and fungal culture were done when necessary.
THC was seen in total 21 cases of seven different hair and scalp disorders. Of these, the majority of cases were of discoid lupus erythematosus (DLE) (5/21) and maximum frequency of THCs within a disorder was seen in cases of pemphigus foliaceus (PF) (50%). Proximal casts occurred in 90.47% of cases. Single cast involving two shafts was seen in a case of PF, and two casts within a single shaft were seen in two cases of DLE and one case of alopecia areata.
THCs in trichoscopy can be seen in various hair and scalp disorders and their study may help during the diagnosis of those disorders when combined with other trichoscopic features.
毛发管型已在多种毛发和头皮疾病中被报道。皮肤镜检查为高倍评估毛发和头皮疾病提供了一种快速且无创的方法。然而，关于皮肤镜下所见毛发管型的研究尚缺乏。
主要目的是研究不同毛发和头皮疾病中管状毛发管型（THC）的发生情况及模式。
对我院皮肤科就诊的毛发和头皮疾病患者进行皮肤镜检查评估。排除原发性角化不全性疾病和行为障碍病例。在详细询问病史并评估毛发和头皮后，必要时进行组织病理学、光学显微镜检查、氢氧化钾检查及真菌培养。
在7种不同的毛发和头皮疾病共21例患者中发现了THC。其中，盘状红斑狼疮（DLE）病例居多（5/21），落叶型天疱疮（PF）病例中THC出现频率最高（50%）。90.47%的病例出现近端管型。1例PF患者出现单个管型累及两根毛发干，2例DLE患者和1例斑秃患者的单个毛发干内出现两个管型。
皮肤镜下的THC可见于多种毛发和头皮疾病，其研究结合其他皮肤镜特征可能有助于这些疾病的诊断。
