Pilomatrixomas en niños: a propósito de 149 casos. Estudio retrospectivo en dos centros pediátricos / Pilomatrixomas in children: Report of 149 cases. A retrospective study at two children's hospitals

El pilomatrixoma es un tumor benigno cutáneo, de frecuente aparición en los niños, que se origina en las células de la matriz del folículo piloso. Se presenta como un nódulo o tumor, aproximadamente, de 0,5 a 3 cm de tamaño, de consistencia cálcica, de bordes facetados, con piel suprayacente eritematoazulada. En ocasiones, la piel puede atrofiarse, dar la apariencia de una ampolla e, incluso, extruir material cálcico. El diagnóstico se sospecha por la presentación clínica característica y los estudios de imágenes complementarios. El diagnóstico definitivo es por los hallazgos histológicos. La extirpación quirúrgica es el tratamiento de elección. Se presentan los datos epidemiológicos, clínicos, estudios complementarios y técnicas quirúrgicas empleadas de 149 pilomatrixomas resecados en 137 pacientes tratados en los Servicios de Dermatología de los hospitales de pediatría Dr. Pedro de Elizalde y Prof. Dr. Juan P. Garrahan.

A pilomatrixoma is a benign skin tumor common in children, which develops from the matrix cells of hair follicles. It presents as a nodule or tumor of approximately 0.5-3 cm in size, with calcium-like consistency, faceted edges, and blue erythematous overlying skin. Sometimes, the skin may atrophy and look like a blister or even extrude calcium. Diagnosis is suspected based on the typical clinical presentation and supplementary imaging tests. The definite diagnosis is made according to histological findings. Surgical removal is the treatment of choice. Here we describe the epidemiological and clinical data, supplementary tests, and surgical techniques in relation to 149 pilomatrixomas resected in 137 patients treated at the Departments of Dermatology of two children's hospitals: Dr. Pedro de Elizalde and Prof. Dr. Juan P. Garrahan.

Uso de Tomografía por emisión de positrones en melanoma maligno cutáneo en el Hospital Carlos Andrade Marín / Use of Positron emission tomography for cutaneous malignant melanoma at the Carlos Andrade Marin Hospital

INTRODUCCIÓN. La Tomografía por Emisión de Positrones ­Tomografía Computarizada, 18 Flúor-Deoxiglucosa, es utilizado para estadiaje, re-estadiaje, seguimiento y respuesta a tratamiento del melanoma cutáneo. OBJETIVO. Valorar la utilidad de la Tomografía por Emisión de Positrones ­Tomografía Computarizada, en la detección de metástasis en los pacientes con melanoma cutáneo. MATERIALES Y MÉTODOS. Estudio observacional, retrospectivo. Información obtenida de la base estadística de la Unidad de Tomografía por Emisión de Positrones­Tomografía Computarizada del Hospital Carlos Andrade Marín, de Quito-Ecuador, desde enero de 2016 hasta junio de 2018. RESULTADOS. Se recopiló la información de 100 pacientes, 48 pacientes cumplieron los criterios de inclusión. La media de edad general fue 64 años (SD 12,5 años). El 35,4% de los pacientes tuvieron ganglio centinela positivo con una frecuencia de secundarismo en el 29,4% (p=0,43). El 60% de pacientes acudió por re-estadiaje. Pacientes con y sin melanoma ulcerado tuvieron un promedio de edad de 67,8 años y 59,8 años, respectivamente. La presencia de metástasis a distancia presenta una estimación de riesgo calculada de 1,57 (IC 95% 1,005 a 2,45) (p = 0,001). DISCUSIÓN. A mayor edad de los pacientes, mayor porcentaje de melanomas ulcerados, siendo estadísticamente significativo. Sin embargo, ninguna de las dos variables tuvo relación estadística con la presencia de metástasis a distancia. No se encontró relación con el espesor de Breslow y presencia de metástasis a distancia. CONCLUSIÓN. El estudio por Tomografía por Emisión de Positrones ­Tomografía Computarizada es el más sensible para la detección de metástasis a distancia, su presencia representa un mayor riesgo de mortalidad.

INTRODUCTION. Positron-Emission Tomography- Computerized Tomography, is used for staging, re-staging, follow-up and response to treatment in patients with cutaneous melanoma. OBJECTIVE. To evaluate the usefulness of Positron-Emission Tomography-Computer Tomography in the detection of metastasis in patients with cutaneous melanoma. MATERIALS AND METHODS. Observational retrospective study. Information obtained from the statistical base of Positron-Emission Tomography- Computerized Tomography Unit of the Carlos Andrade Marin, Hospital Specialty in Quito-Ecuador, from January 2016 to June 2018. RESULTS. Information was collected from 100 patients, 48 met the inclusion criteria. The general average age was 64,19 years (SD 12,5 years). 35,4% of the patients had a positive sentinel lymph node and 64,6% with a secondary frequency in 29,4% (p = 0,43). In 60% of patients, the reason for the request was re-staging. Patients with and without ulcerated melanoma had an average age of 67,8 years and 59,8 years, respectively. The presence of distant metastasis presents a calculated risk estimate of 1,57 (95% CI 1,005 to 2,45) (p = 0,001). DISCUSSION. The higher percentage of ulcerated melanomas was found in older people, being statistically significant; however, none of the two variables had a statistical relationship with the presence of distant metastases. No relationship was found with the Breslow thickness and the presence of distant metastasis. CONCLUSION. The study by Positron-Emission Tomography- Computerized Tomography, is the most sensitive for the detection of distant metastasis; they represent a higher risk of mortality.

Siringocistoadenoma papilífero: reporte de 11 casos del Hospital Clínico de la Universidad de Chile / Papilliferum Syringocystoadenoma: report of 11 cases of Clinical Hospital of the University of Chile

Introducción: El siringocistoadenoma papilífero (SP) es un tumor anexial benigno inusual, de etiología desconocida. Por lo general, se presenta desde el nacimiento, o en la primera infancia como una lesión aislada, frecuentemente asociada a un nevo sebáceo de Jadassohn. Objetivo: Describir y analizar las características demográficas, clínicas e histopatológicas del SP. Materiales y métodos: Revisión retrospectiva de informes histopatológicos del Departamento de Anatomía Patológica del Hospital Clínico de la Universidad de Chile entre los años 2005 y 2016. Se incluyeron todas las muestras que describieron dentro del diagnóstico histológico las palabras "siringocistoadenoma papilífero". Resultados: La muestra está compuesta por 11 pacientes; 9 mujeres y 2 hombres. En 5 pacientes, se desarrolló un SP a partir de un nevo sebáceo y en 6 surgió de novo. El total de la muestra desarrolló el SP durante o posterior a la pubertad. Tanto los pacientes con SP solitario, como aquellos asociados a un nevo sebáceo, presentaron clínica similar con una placa o pápula verrucosa aislada. Los principales diagnósticos diferenciales fueron el nevo sebáceo, nevo verrucoso y verruga. Conclusiones: Este estudio constituye la primera serie de casos de SP en un hospital en Santiago de Chile. La forma clínica más frecuente fue como placa verrucosa solitaria asintomática, con casos aislados como pápula verrucosa y sólo un caso con aspecto de cuerno cutáneo. Se destaca el rol de la extirpación quirúrgica completa, tanto para establecer el diagnóstico, como para ofrecer un tratamiento definitivo, disminuyendo el riesgo de transformación maligna a siringocistoadenocarcinoma papilífero.

Introduction: Syringocystoadenoma papilliferum (SCAP) is an unusual benign adnexal tumor of unknown etiology. Usually it is presented at birth or in early childhood as an isolated lesion associated with nevus sebaceous of Jadassohn. Objective: To describe and analyze the demographic, clinical and histopathological characteristics of SCAP. Materials and methods: A retrospective review of histopathological reports was performed at the Clinical Hospital´s Department of Pathological Anatomy from the University of Chile including biopsies from 2005 to 2016. All the samples that described the histological diagnosis of "syringocystoadenoma papilliferum" were included. Results: The sample consists of 11 patients; 9 women and 2 men. In 5 patients, an SCAP was developed from a sebaceous nevus and in 6 it developed de novo. The total sample developed SCAP during or after puberty. Both the patients with solitary SCAP, and those associated with nevo sebaceous, presented similar clinical signs with an isolated verrucous plaque or papule. The main differential diagnoses were the nevo sebaceous, warty nevus and wart. Conclusions: This study is the first SCAP case series in Santiago, Chile. The most frequent clinical form was an asymptomatic solitary verrucous plaque, with isolated cases as a verrucous papule and a single case as a cutaneous horn. The role of complete surgical resection is highlighted, both to establish the diagnosis and to offer a definitive treatment, reducing the risk of malignant transformation to syringocystadenocarcinoma papilliferum.

Múltiplos cilindromas dérmicos, tratamento adequado e revisão da literatura / Multiple dermal cylindroma, appropriate treatment and literature review

Os cilindromas são tumores de apêndices cutâneos. Apresentamse normalmente na área da cabeça e pescoço. Muitas modalidades foram descritas para seu tratamento. Apresentamos aqui o caso de uma idosa que se apresentou com lesões recorrentes e que recebeu a opção de fazer uma excisão radical de todas as lesões versus a excisão das lesões sintomáticas. Ela optou por remover as lesões sintomáticas. A excisão cirúrgica das lesões sintomáticas é uma alternativa razoável para pacientes idosos.

Cylindromas are tumors of skin appendages. They present most commonly in the head and neck area. Many modalities have been described to treat them. We present a case of an elderly female who presented to us with recurrent lesions and was offered radical excision of all lesions versus excision of symptomatic lesions. She opted for the removal of symptomatic lesions. Surgical excision of symptomatic lesions is a reasonable alternative in elderly patients.

Cutaneous metastases in a patient with no previous diagnosis of cancer: diagnostic challenge

Abstract: On rare occasions, skin lesions are the first local of metastatic manifestation of internal malignancies. In case of no previous diagnosis of these tumors, the approach of suspicious skin lesions becomes a challenge, especially in differentiating cutaneous metastases and adnexal primary neoplasms. Currently, besides epidemiologic, dermoscopic and histopathologic aspects, the evaluation also integrates immunohistochemical exams and cell markers such as p40 and p63, highly specific for skin metastases. This article describes the case of cutaneous metastases as the sole obvious sign of breast cancer in a previously asymptomatic woman. The diagnosis was made by the finding of neoplastic cells in the dermis and immunohistochemistry compatible with ductal carcinoma.

Tricoblastoma de localización acral, una ubicación infrecuente: reporte de un caso / Acral location trichoblastoma, a location infrequent: report of a case

Tricoblastoma es una neoplasia anexial benigna de la piel, de difícil diagnóstico clínico, por su baja prevalencia y por la ausencia de características clínicas patognomónicas. Por esta razón, es la biopsia la que hace el diagnóstico definitivo, ya que se suele confundir con otras neoplasias anexiales. Se presenta caso clínico de una mujer de 87 años con historia de cinco años de evolución de lesión nodular, sésil y simétrica ubicada en la falange proximal del primer ortejo del pie izquierdo, la cual había presentado un crecimiento progresivo en los últimos seis meses, refiriendo molestias leves con el calzado, sin mayores complicaciones. La biopsia excisional de la lesión, es informada como tricoblastoma. El escaso conocimiento del tricoblastoma lleva a la incorrecta interpretación de su forma clínica, lo que resulta relevante, pues su principal diagnóstico diferencial corresponde al carcinoma basocelular (CBC). Se presenta el caso clínico por lo infrecuente de su localización, lo que indujo a confusión del diagnóstico. No se debe olvidar que el tricoblastoma es una neoplasia anexial benigna, que puede presentarse en cualquier sitio en el que existan folículos pilosebáceos, por lo que hay que considerarlo dentro de los diagnósticos diferenciales de cualquier neoplasia anexial.

Trichoblastoma is a skin benign adnexal neoplasm, clinical diagnosis is difficult because presents a low prevalence, it has not any pathognomonic clinical characteristics and it's often mistaken with other adnexal tumors; so the biopsy makes the definitive diagnosis. We report the case of a woman of 87 years with a history of 5 years of evolution of a nodular, sessile and symmetrical lesion located in the proximal phalanx of the first left toe, which had presented a progressive growth in the last 6 months, she presented mild discomfort with footwear, without major complications. The excisional biopsy of the lesion, was reported as a trichoblastoma. Poor knowledge of trichoblastoma leads to a clinical misinterpretation, which is relevant, because its main differential diagnosis corresponds to basal cell carcinoma (BCC). A case located on an extremely rare location is presented, which led to confusion in clinical diagnosis. You must not forget that trichoblastoma is an adnexal benign tumor, which can occur at any site with pilosebaceous follicles, so we should consider in the differential diagnoses of any skin adnexal neoplasms.

Carcinoma triquilemal, um tumor incomum: atualização sobre manejo e prognóstico / Trichilemmal carcinoma, an uncommon tumor: update on its management and prognosis

INTRODUÇÃO: O carcinoma triquilemal (CT) é uma neoplasia rara dos anexos cutâneos. Foi descrito pela primeira vez em 1968, como tricoleptocarcinoma, e tem incidência de 0,05% em pacientes submetidos a exame histopatológico após excisão de lesões cutâneas. Parece ser um tumor de baixa agressividade, porém, relatos na literatura colocam em dúvida tal comportamento indolente. OBJETIVOS: Oferecer uma atualização sobre manejo e prognóstico do CT. MÉTODOS: Pesquisa no PubMed e SciELO com os termos MeSH "trichilemmal carcinoma", "tricholemmal carcinoma", "adnexal skin tumor", "carcinoma triquilemal". RESULTADOS: Devido a sua raridade, a maior parte da literatura se baseia em relatos de caso, os quais na sua maioria corroboram a natureza indolente da doença. Excisão cirúrgica é o tratamento preconizado, com baixo risco de recidiva e baixa morbimortalidade. CONCLUSÃO: O comportamento da lesão e as condutas no tratamento do CT baseiam-se em casos isolados ou de pequenas séries de casos. Devido a sua baixa prevalência, uma colaboração multicêntrica agrupando um maior número de casos pode ajudar a definir melhor recomendações de tratamento, fisiopatologia e prognóstico. Excisão cirúrgica continua a ser o padrão-ouro de tratamento, com baixo risco de recidiva.

INTRODUCTION: Trichilemmal carcinoma (TC) is a rare neoplasm of skin appendages. It was first described in 1968 as tricoleptocarcinoma, and has an incidence of 0.05% in patients subjected to histopathological examination after excision of cutaneous lesions. TC has an indolent clinical course ; however, reports in the literature put in doubt this indolent behavior. OBJECTIVES: To provide an update on the management and prognosis of TC. METHODS:A search of the PubMed and SciELO databases by using with the MeSH terms "trichilemmal carcinoma", "tricholemmal carcinoma", "adnexal skin tumor", and "carcinoma triquilemal" was performed. RESULTS: Owing to the rarity of TC, most studies were case reports, which essentially corroborate the indolent nature of the disease. Surgical excision is the recommended treatment, and is associated with a low risk of recurrence and low morbidity and mortality. CONCLUSION: The behavior of the lesion and the procedure of treatment of TC are based on isolated cases or in a small series of cases. Because of its low prevalence, a multicenter collaboration of a greater number of cases can help define the best treatment recommendations, pathophysiology, and prognosis. Surgical excision remains the gold standard of treatment, and is associated with a low risk of recurrence.

Pilomatricoma Unmasked on Fine Needle Aspiration Cytology.

Pilomatrixoma is an uncommon adnexal tumor with heterogeneous features can mimic various malignancies and contributes to false positive diagnosis on cytology. It is an uncommon, slow growing, benign skin adnexal neoplasm of hair matrix origin initially described by Malherbe and Chenantais. This tumor is predominantly found in the head and neck region, and presents as a small, asymptomatic, slow-growing dermal, subcutaneous, solitary lesion. More than 50% of these tumors are known to occur in the second decade of life and is often misdiagnosed clinically. Cytological features pose a diagnostic challenge although the histological features are very well delineated. This paper presents the cytological features in two cases outlining the importance of the clinicopathological features that need to be considered for an accurate diagnosis. Awareness of its varied cytologic features and clinical presentation can avoid misdiagnosis.

Tumor of follicular infundibulum with unique features

Tumor of the follicular infundibulum is a rare benign cutaneous adnexal neoplasm with variable clinical presentation. In most cases the diagnosis is made with the help of histopathology, due to lack of a characteristic clinical presentation. The most common form is a solitary lesion, but it can be multiple or eruptive, then called infundibulomatose. This case report illustrates a patient with multiple lesions of tumor of the follicular infundibulum with bizarre aspect and atypical location.

Skin Tumours – Histopathological Review of 125 Cases.

The skin is the largest organ in the body. A wide variety of hyperplastic growths and tumours, both benign and malignant are encountered in the clinical practice. Any lesion, for which the diagnosis is uncertain, based on the history and clinical examination should be biopsied for histopathological examination to rule out malignancy. Objective: To analyze retrospectively tumours of skin with respect to age, sex, clinical features and histopathological features in a tertiary referral centre in Maharashtra, India. Material & Methods: The present study consisted of analysis of tumours of skin received in the histopathology section of department of pathology over a period of 5 years that is from August 2005 to July 2010. The material comprised of biopsies and excision specimens. The clinical and histopathological details were noted. The findings were compared with those reported by other authors. Results: One twenty five (125) tumours of skin were observed. The benign tumours were slightly more common (51.2%) than malignant tumours (48.8%). The maximum number of tumours was found in 7th decade (25.6%). Maximum number of tumours were found in third decade in benign tumours (20.3%) and seventh decade in malignant tumours (37.7%). Both benign and malignant tumours of skin were common in males than females. The equal numbers of skin tumours were seen in both the head and neck region (44.8%) and the extremities (44.8%). Face was the commonest site for skin tumours (35.2%). The keratinocytic tumours, both benign and malignant were common tumours of skin (62.4%) while neural tumours were rarely observed (1.6%). The Squamous Cell Carcinoma (SCC) was the commonest malignant tumour (45.9%) followed by Basal Cell Carcinoma (BCC) (34.4%). Verrucas (32.8%) were the commonest benign tumours followed by pyogenic granuloma (21.9%). Conclusion: SCC is the most common malignant skin tumour in India, unlike the Western countries. Histopathological study is a very important step in the diagnosis of skin tumours.

Aspectos clínicos y epidemiológicos de los tumores anexiales / Clinical and epidemiologic features of adnexa tumors

Introducción: los tumores anexiales representan una patología ginecológica frecuente e importante, de ahí su valor clínico. Objetivo: determinar la presencia de los tumores anexiales teniendo en cuenta algunos aspectos clínicos y epidemiológicos. Métodos: estudio descriptivo longitudinal en el período de tiempo comprendido entre el 1ro. de enero de 2008 al 1ro. de enero de 2010, con un grupo de mujeres con diagnóstico de masa anexial, para valorar algunos aspectos clínicos y epidemiológicos: edad, localización, los antecedentes familiares de cáncer anexial y los antecedentes obstétricos...

Introduction: the adnexal tumors are a frequent and important gynecologic pathology, thus, its clinical value. Objective: to determine the presence of adnexal tumors taking into account some clinical and epidemiological features. Methods: a longitudinal and descriptive study was conducted from January 1, 2008 to January 1, 2010 in a group of women diagnosed with adnexal mass, to assess some clinical and epidemiological features including age, location, and family history of adnexal cancer as well as obstetrics...

Adnexal Clear Cell Carcinoma with Comedonecrosis: A Case Report

Adnexal clear cell carcinoma with comedonecrosis (ACCCC) is a very rare malignancy of the skin with an aggressive clinical course and a predilection for the scalp. This is the first reported case of ACCCC in Korea. A 79-year-old male presented with left abdominal masses that proved to be two subcutaneous nodules. The tumors histologically consisted of epithelial nests that showed a distinctive zonal arrangement. The centrally located clear cell areas with comedonecroses were merged with the peripheral squamoid cells, often exhibiting retraction artifacts and an infiltrating border. Nuclear pleomorphism and frequent mitoses were prominent. The clear cells were immunopositive for carcinoembryonic antigen and epithelial membrane antigen. We report here on a case of ACCCC involving the abdominal skin, and this tumor should be distinguished from the more indolent squamous cell and tricholemmal carcinomas.

Estudio clínico y epidemiológico de los tumores anexiales en la cátedra de Dermatología de la Facultad de Ciencias Médicas de la Universidad Nacional de Asunción: Paraguay, 2002-2008 / Clinical and epidemiological study of adnexal tumours at the Dermatology of the Facultad de Ciencias Médicas of the Universidad Nacional de Asunción: Paraguay, 2002-2008

Introducción: los tumores anexiales constituyen un grupo de entidades relativamente infrecuentes y de difícil diagnóstico. Objetivos: describir la prevalencia y las características clínicas de los casos de tumores cutáneos anexiales en la cátedra de Dermatología del Hospital de Clínicas. FCM-UNA. Clasificar los tumores de acuerdo a la estructura anexialde la cual derivan. Determinar la correlación entre la apreciación clínica y el diagnóstico dermatopatológico. Determinar la prevalencia de tumores anexiales cutáneos benignos y malignos. Material y métodos: estudio descriptivo de serie de casos de 2.637 diagnósticos dermatopatológicos de la cátedra de Dermatología del Hospital de Clínicas en el periodo 2002-2008. Resultados: se encontraron 36 pacientes con tumores cutáneos anexiales representando una prevalencia del 1.4%. El diagnóstico fue más frecuente en mujeresy el 53% de pacientes era mayor de 40 años. Los tumores resultaron ser benignos en 33 casos (92%) y malignos en tres (80/0E). El mayor número de diagnósticos histopatológicos correspondió al grupo de tumores anexiales originados en las glándulas sudoríparas (ecrinas y apocrinas) con 19 casos (53%). Se realizó correlación clínico-patológica en un 14% de 105 pacientes, siendo el diagnóstico definitivo histopatológico en más del 50% de los casos. Conclusiones: los tumores anexiales cutáneos se diagnostican con una frecuencia baja y son difíciles de diferenciar por la clínica, lo que se corrobora por la escasa correspondencia entre ésta y la dermatopatología. La incidencia de tumores anexiales malignos es baja.

Background: adnexal skin tumors are, agroup of relatively rare diseases, difficult to diagnose. Aims: to describe the prevalence and clinical characteristics of adnexal skin tumors in the Dermatology Department, Clínicas Hospital. FCM-UNA. To classify tumors according to the adnexal structure from which they derive. To determine the correlation between clinical assessment and dermatopathological diagnosis. To determine the prevalence of benign and malígnant adnexal skin tumours. Methods: descriptive case series study of 2.637 dermatopathological cases from the Dermatology Department, at Clínicas Hospital in the period 2002-2008. Results: there were 36 patients with adnexal skin tumors, prevalence of 1.4%. These diagnoses were more common in women and 53% of patients were older than 40 years. The tumors were benign in 33 cases (92%) and malignant in 3 cases (8%). The highest number of his to pathological diagnoses corresponded to the group of adnexal tumors arising in sweat glands (eccrine and apocrine) with 19 cases(53%). There was a clinicopathological correlation in 14% of patients, and in histopathological diagnosis by more than 50% of cases. Conclusions: cutaneous adnexal tumors are diagnosed with low frequency and are difficult to distinguish by just the clinical aspects, which is corroborated by the low correspondence between them and the dermatopathology aspects. The incidence of malignant adnexal tumors is low.

Tricoepitelioma desmoplásico múltiple de mejillas: a propósito de un caso / Multiple desmoplastic trichoepithelioma: a case report

El tricoepitelioma es una neoformación benigna diferenciada hacia el folículo piloso. Clínicamente puede presentarse en forma múltiple, solitaria o desmoplásica. Histológicamente plantea algunas dificultades para diferenciarlos del carcinoma basocelular (CSC). Se comunica el caso de una mujer de 28 años de edad y se revisa brevemente la literatura.

Trichoepithelioma is a benign neoformation differentiated from the hair follicle, clinical manifestations can be solitary, multiple or desmoplastic lesions. Histologically, it is not easy to differentiate from basal cell carcinoma. We report the case of a 28-year-old woman, and short review.

Síndrome de Brooke-Spiegler: presentación de un caso que combina tricoepitelioma, espiroadenoma y cilindroma en una misma lesión / Syndrome of Brooke-Spiegler: presentation of a case that combines tricoepitelioma, espiroadenoma and cilindroma in a same injury

El síndrome de Brooke-Spiegler (SBS) es una entidad rara, autosómica dominante, que consiste en la asociación entre múltiples tumores anexiales. Los más frecuentes son cilindromas, tricoepiteliomas y, ocasionalmente, espiroadenomas. En general son pequeñas tumoraciones de color piel, firmes y bien definidas; suelen aparecer entre la segunda y tercera década de la vida con predominio en el sexo femenino. Su transformación maligna es sumamente inusual. Presentamos una mujer de 34 años a quien se le halló, en una lesión localizada en su pierna derecha, rasgos histopatológicos combinados de tricoepitelioma, espiroadenoma ecrino y cilindroma.

Signo de la piedra facetada: diagnóstico del pilomatrixoma / Sign of the facetada stone: diagnosis of pilomatrixoma

El pilomatrixoma es un tumor cutáneo epitelial benigno cuyo origen radica en las células de la matriz del folículo piloso. Es una patología que aparece con poca frecuencia. Considerando que el diagnóstico clínico de pilomatrixoma suele resultar dificultoso, el propósito de este trabajo es ratificar un signo que nos facilitó ese diagnóstico: la palpación de un tumor de consistencia pétrea, en el que se hacen evidentes planos unidos por aristas con el aspecto de un piedra facetada. Consideramos que el signo de la piedra facetada es patognomónico de pilomatrixoma. Este concepto fue publicado en un trabajo en 1989 en Medicina Cutánea.

Dermatofibromas eruptivos múltiplos einfecção pelo HCV tratada com interferon / Multiple eruptive dermatofibromas and HCV infection treated by interferon

O dermatofibroma é um tumor fibrohistiocístico benigno comum. Os dermatofibromas eruptivos múltiplos são definidos arbitrariamente pela presença de 15 ou mais dermatofibromas ou pelo desenvolvimento de 5 a 8 destes em um período menor do que 4 meses. A patogênese dos dermatofibromas eruptivos múltiplos ainda permanece incerta, mas há estudos que relacionam seu aparecimento a determinadas doenças auto-imunes, doenças infecciosas e uso de imunomoduladores. É importante pesquisar e reconhecer o quadro descrito como dermatofibromas eruptivos múltiplos, pois ele pode ser indicativo de importante condição subjacente. Nosso relato descreve o caso de um homem portador do vírus da hepatite C que fez uso de alfa-interferon e que, posteriormente, desenvolveu múltiplos dermatofibromas. No contexto da infecção pelo HCV e do uso de interferon, o quadro de DEM poderia estar relacionado à infecção propriamente dita e/ou a um efeito idiossincrásico da droga

Dermatofibroma is a common benign fibrohistiocystic tumor. Multiple eruptive dermatofibromas are defined arbitrarily as more than 15 dermatofibromas or 5 to 8 dermatofibromas developing over a span of less than 4 months. A etiology is unknown, but there are studies that relate their appearance to determined self-immune illnesses, infectious illnesses and use of immunomodulators. It is important to search and to recognize the described picture as multiple eruptive dermatofibromas, therefore it can be indicative of important underlying condition. Our story describes the case of a carrying man of HCV that made alpha-interferon use and that, later developed multiples dermatofibromas. In the context of the infection for the HCV and the use of interferon, the multiple eruptive dermatofibromas picture could be related to the infection properly said and/or an idiosyncratic effect of the drug