A dermoscopic clue for the diagnosis of traction alopecia: Peripilar keratin casts: Case report [Traksiyonalopeside Tanisal Dermoskopik Bir ?pucu: Peripilar Keratin Kilif]

Traction alopecia is a traumatic hair loss as a result of excessive pulling of the hair on the margins or nonmarginal area of the scalp due to hairstyles. Peripilar keratin casts is a cylindrical structure that encircles the hair shaft placed at the periphery of the alopecia plaque. It is derived from the inner and/or outer hair root sheath cells and it develops because of persistent hair traction. The most common misdiagnosed is louse eggs or nits. Other diagnosis that must be considered include squamous disease of the scalp such as psoriasis, pityriasis simplex and seborrheic dermatitis. This structure is a useful dermoscopic finding for physician in both diagnosis and follow-up of traction alopecia. Here, we describe a thirty-four-year-old women with traction alopecia whose diagnosis is clarified by the presence of peripilar keratin cast. © 2015 by Türkiye Klinikleri

Hypersensitivity to cardiovascular implants : Stents

Percutaneous coronary interventions and stenting have existed since the 1970s. Stents can be made of different materials and have different designs. A complication to the intervention and especially to bare metal stents is in-stent restenosis with neointimal proliferation and chronic inflammation, which has several causes briefly discussed below. A possible association between stents and metal allergy has been investigated. With regard to stents, studies have been mainly retrospective, in itself a limitation, and show somewhat disparate results. This chapter will focus on some of these findings but also on general knowledge of stents and what happens in the vessel. This insight is meant to assist those who advise patients and cardiologists and who investigate patients with stents where question of metal allergy is raised