Dermoscopy of trichostasis spinulosa

<p>TRICHOSTASIS SPINULOSA (TS) is a relatively common but underdiagnosed disorder of hair follicles that retain successive telogen hairs. It has been described within skin lesions (secondary TS) or as an isolated finding (primary TS). Dermoscopy may help identify the characteristic hair tuft. We report 2 cases of TS. The first case involved a 23-year-old woman who presented with a long-standing history of a light-brown papule on the lower part of her back. There was a black punctum in the upper central area of the lesion (Figure 1). Dermoscopy showed a sparse pigment network, multiple commalike blood vessels that are typical of intradermal melanocytic nevi, a few peripheral vellous hairs, and a small hair tuft emerging from the central punctum (Figure 2). Histologic examination confirmed the presence of an intradermal melanocytic nevus along with dilated folliculosebaceous bunits containing several cross-sectioned hair shafts (Figure 3). The second case involved a 30-yearold man who presented with a micropapular eruption on both flanks. Dermoscopy showed multiple vellous hairs erupting through the follicles (Figure 4).</p> <p>Hair tufts are the result of folliculosebaceous hamartomas with multiple units around a central pore (trichofolliculomas) or retained hair shafts within follicles with infundibular keratosis (TS). Trichostasis spinulosa may appear as an isolated finding or in association with expansile nondestructive lesions that narrow hair infundibulae, such as melanocytic nevi, seborrheic keratoses, syringomas, or nodular basal cell carcinomas. Dermoscopy is helpful in diagnosing TS.</p

管花肉苁蓉产地适宜性之再分析[C]

目的：对管花肉苁蓉产地适宜区进行分析以指导管花肉苁蓉区划和生产。方法：应用“中药材产地适宜性分析地理信息系统”，以新疆南疆管花肉苁蓉分布区的生态因子为依据，分析管花肉苁蓉在全国适宜产地。结果：管花肉苁蓉最适宜产区只在新疆南疆塔克拉玛干沙漠边缘的27个县市，分布有明显的区域性。结论：管花肉苁蓉与其寄主植物柽柳的分布不同步，管花肉苁蓉在新疆北疆及我国其他省区种植应慎重