Abstract: Trichoscopy has become an essential tool for the diagnosis of various diseases that affect the hair and scalp. Through dermatoscopy we identified a set of findings that share a circular shape of hair shafts. The objective of this study is to distinguish among the various forms of circular hairs in order to identify their peculiarities and to describe in which skin disorders they can be found.

Abstract: Neurofibromatosis type 1 is a multisystem genetic disease of autosomal dominant transmission that reveals important cutaneous manifestations such as café-au-lait spots, multiple neurofibromas, and ephelides in skin fold areas, as well as hamartomatous lesions in the eyes, bones, glands, and central nervous system. Moyamoya disease is a rare progressive vaso-occlusive disorder that occurs with important ischemic cerebrovascular events. Despite the rarity of this association in childhood, children diagnosed with neurofibromatosis type 1 and focal neurologic symptoms should be investigated for moyamoya syndrome. The present study reports the case of a pediatric patient with a rapidly progressive cerebrovascular accident and a late diagnosis of Neurofibromatosis type 1 associated with moyamoya disease.

O histiocitoma eruptivo generalizado é considerado um subtipo extremamente raro de histiocitose de células não-Langerhans. Na literatura, existem poucos relatos sobre a doença que afeta principalmente adultos. Neste relato apresentamos um caso de histiocitoma eruptivo generalizado em um paciente idoso com sintomas há dois meses. Clinicamente observavam-se pápulas eritematosas múltiplas, assintomáticas, simetricamente distribuídas no tronco e membros. O exame histopatológico mostrou uma infiltração de células mononucleares densa na derme. Na análise imunohistoquímica, as células foram positivas para CD68, mas negativas para CD1a, CD34 e S100. O objetivo do nosso trabalho é relatar um caso de uma doença muito rara, cujos subtipo e faixa etária afetados são ainda mais incomuns.

Generalized eruptive histiocytoma is considered an extremely rare subtype of non-Langerhans cells histiocytosis. In the literature, there are few reports of this disease that mainly affects adults. In this report, we present a case of generalized eruptive histiocytoma in an elderly patient who had presented symptoms for over two months. Multiple erythematous papules, asymptomatic and symmetrically distributed were observed on the trunk and limbs. Histological examination showed a dense mononuclear cell dermal infiltrate. In the immunohistochemical analysis, the cells were CD68 positive, but CD1a, S100 and CD34 negative. A diagnosis of generalized eruptive histiocytoma was established. The aim of our paper is to report a case of a very rare disease, whose subtype and affected age group are even more unusual.