Neste trabalho, apresentaremos experimentos portáteis no intuito de abordar os conceitos da indução eletromagnética com alunos do Ensino Básico. Os materiais utilizados para a realização dos experimentos são de fácil aquisição e o conjunto deles pode ser adquirido na forma de um kit, facilmente transportável. A proposta é que os alunos aprendam os conceitos por meio de discussão em sala e da execução de experimentos. Para isso, será dado maior destaque às aulas interativas em detrimento das expositivas. Assim, nos inspiramos na metodologia desenvolvida pelo grupo da Universidade de Rutgers, liderado pela professora Eugenia Etkina. A fundamentação dessa proposta é que os alunos estudem e aprendam os conceitos físicos de forma semelhante à forma que os cientistas trabalham para construir o conhecimento científico. Tal metodologia foi denominada “Investigative Science Learning Environment” (ISLE). Desta feita, os alunos são apresentados ao método científico, ainda no Ensino Médio, de forma concreta, em que a observação, a proposição e a refutação de hipóteses são fundamentais para a criação de um modelo para o fenômeno físico estudado. Para avaliar a metodologia e os experimentos portáteis, apresentamos uma proposta de sequência didática a ser aplicada em uma turma da terceira śerie do Ensino Médio.

In this paper we will present a portables experiments in order to approach the concepts of electromagnetic induction to Basic Education students. The materials used to perform the experiments are easy to acquire, and the set of them can be purchased in the form of an experimental kit, easily transportable. The proposal is that students learn the concepts through classroom discussion and the execution of experiments, with greater emphasis on interactive classes over lectures. For this, we were inspired by the methodology developed by the group from Rutgers University, led by Professor Eugenia Etkina. The foundation of this proposal is that student’s study and learn physical concepts similar to the way scientists work to setup scientific knowledge. Such methodology was called “Investigative Science Learning Environment” (ISLE). In this method, students are introduced to the scientific method, in high school, in a concrete way where observation, proposition and refutation of hypotheses are fundamental for creating a model for the physical phenomenon studied. To evaluate the methodology and use of the portable experiment, we present a proposal for a didactic sequence to be applied to a twelve-year high school class.

Abstract Given the potential of acid-activated clays in adsorptive and catalytic processes, several studies focusing on acid matrices have grown over the years, making it possible to study vermiculite, a mineral composed of a type 2:1 unit cell with tetrahedral and octahedral sheets. Therefore, this work aimed to study vermiculite treated with acids for the production of matrices. In this work, the treatment of natural vermiculite-hydrobiotite, with nitric acid in concentrations of 0.25, 0.50, 0.75, and 1 mol.L-1, followed by the dealumination process with sulfuric acid 25% v/v, aiming the production of acid matrices for applications as support for biocatalysts, chemical adsorbents, among others. The produced materials were characterized using different techniques, including X-ray fluorescence spectroscopy, X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and isotherm adsorption using the BET method. The results showed that after acid leaching the vermiculite showed a high SiO2 content, high Brønsted and Lewis surface acidity, good adsorption/desorption performance, and significant growth of the specific surface area, qualifying the vermiculite as a promising material for future applications in catalytic and biocatalytic processes. The acid concentration had a considerable influence on the compositional and textural modification of vermiculite-hydrobiotite.

ABSTRACT: The odontogenic keratocyst is a lesion with specific clinical and histopathological aspects. The World Health Organization (WHO) in 2017 reclassified it from a tumor to a cyst. It is characterized as a cyst of epithelial development of the jaws, arising from the remains of the dental blade. It represents 3 % to 11 % of all odontogenic cysts and 7 to 11 % of cysts of the gnatic bones. It stands out for its aggressive nature and high relapsing potential. Most of the cases are diagnosed in individuals between 10 and 40 years old, with a mild preference for the masculine gender, occurring more in the mandible. Radiographically, it is radiolucent and well delimited, predominantly unilocular, and may cause displacement of adjacent teeth. The present study aims to report a clinical case of a female 25 years old patient, presenting an intra-osseous lesion in the maxilla (posterior, left side), asymptomatic, with a slight increase in intraoral buccal volume, containing the tooth 28, with a diagnostic hypothesis of Odontogenic Keratocyst. The patient was submitted to the surgical decompression treatment, with cystic fluid puncture, biopsy of the lesion and posterior anatomopathological examination. The enucleation of the tumor was performed using LeFort I osteotomy of maxilla and reconstruction with titanium mesh. There is radiographic evidence of bone repair and lesion reduction. The patient is in periodic follow-up of 4 years and does not present clinical and radiographic signs of relapse. Due to the aggressiveness of the odontogenic keratocyst, the relapse rate is high. The knowledge of the techniques recommended for the treatment of Odontogenic Keratocysts and the clinical and radiographic follow-up of the patient demonstrate a gradual decrease of the lumen of the lesion and suggest local bone neoformation, favoring the prognosis of the case.

RESUMEN: El queratoquiste odontogénico es una lesión con aspectos clínicos e histopatológicos específicos. La Organización Mundial de la Salud (OMS) en 2017 lo reclasificó de un tumor a un quiste. Se caracteriza como un quiste de desarrollo epitelial de las mandíbulas, que surge de los restos de la lámina dental. Representa del 3 % al 11 % de todos los quistes odontogénicos y del 7 al 11 % de los quistes de los huesos gnáticos. Se destaca por su naturaleza agresiva y su alto potencial de recaídas. La mayoría de los casos se diagnostican en individuos de entre 10 y 40 años, con una leve preferencia por el sexo masculino, que ocurre más en la mandíbula. Radiográficamente, es radiotransparente y bien delimitado, predominantemente unilocular, y puede causar el desplazamiento de los dientes adyacentes. El presente estudio tiene como objetivo reportar el caso clínico de una paciente de 25 años, que presenta una lesión intraósea en el maxilar (posterior, lado izquierdo), asintomática, con un ligero aumento en el volumen bucal intraoral, que contiene el diente 28, con una hipótesis diagnóstica de queratoquiste odontogénico. El paciente fue sometido al tratamiento quirúrgico de descompresión, con punción de líquido quístico, biopsia de la lesión y examen anatomopatológico posterior. La enucleación del tumor se realizó con osteotomía LeFort I de maxilar y reconstrucción con malla de titanio. Existe evidencia radiográfica de reparación ósea y reducción de la lesión. El paciente se encuentra en seguimiento periódico de 4 años y no presenta signos clínicos ni radiográficos de recaída. Debido a la agresividad del queratoquiste odontogénico, la tasa de recaída es alta. El conocimiento de las técnicas recomendadas para el tratamiento de los queratoquistes odontogénicos, y el seguimiento clínico y radiográfico del paciente, demuestran una disminución gradual del lumen de la lesión y sugieren neoformación ósea local, favoreciendo el pronóstico del caso.

ABSTRACT: Many orthodontic treatments alone cannot reestablish an ideal occlusion, requiring correction through orthognathic surgery. An adequate surgical planning, execution and case follow-up can provide surgical stability between the maxilla and the mandible. Soft tissue conservation and proper correction during a healing phase are important to achieving this goal. Patient C.L.B.S, 38 years old, female, presented with Angle Class I occlusion, facial profile class II, maxilla with mobility, chin surgically advanced and anterior open bite. She was submitted to orthognathic surgery 10 years ago. In the panoramic radiography the absence of bone formation in the maxilla was observed, causing an open bite. For the surgery conventional radiographs were used, as well as the dental cast in articulator for model surgery and preparation of surgical guide. With the surgery an improvement in the patient's aesthetics profile and an ideal occlusion, static and functional were expected. The treatment was orthodontic-surgical, with correction of the dento-facial deformity with counter-clockwise rotation of the maxilla, lowering repositioning in 3 mm of its posterior portion through Le Fort I osteotomy, advancement of the 4 mm mandible with bilateral sagittal osteotomy, and genioplasty for posterior repositioning with a Z-osteotomy, to improve mentual harmony. There was an improvement in the profile and aesthetics of the patient, which developed an Angle Class I profile, a decrease in the mentual projection, and an aesthetic and functional improvement. The orthognathic surgery allowed the advancement of the mandible, the repositioning of the maxilla and the mentual posterior repositioning, obtaining the correction of the Angle class II profile and the anterior open bite, resulting in an important improvement of facial profile and esthetics, presence of skeletal stability, restoration of function, self-esteem and quality of life.

RESUMEN: En muchos casos, el tratamiento ortodóntico por si solo no puede restablecer una oclusión ideal, siendo necesaria una cirúrgia ortognática. Una buena planificación quirúrgica, ejecución y seguimiento del caso, pueden proporcionar estabilidad entre los maxilares. La preservación de los tejidos blandos y una fijación adecuada son esenciales para ese objetivo. La paciente CLBS, 38 años, se presentó con oclusión Clase I de Angle, teniendo perfil clase II, maxilar con movilidad, mentón quirúrgicamente avanzado y mordida abierta anterior. La paciente fue sometida a cirugía ortognática 10 años antes. En radiografía panorámica, se nota la ausencia de formación ósea debido a una fijación maxilar realizada erróneamente, lo que causó la mordida abierta. Durante la planificación, fueron utilizadas radiografías convencionales, modelos de yeso en articulador para cirugía de modelo y confección de guía quirúrgica. Con el procedimento quirúrgico se esperaba obtener una mejora en el perfil de la paciente y una oclusión ideal, estática y funcional. El tratamiento fue ortodóntico-quirúrgico, con corrección de la deformidad dento-facial con giro antihorario de la mandíbula, con reposicionamiento inferior de 3 mm de su parte posterior, por medio de osteotomía Le Fort I, avance de la mandíbula de 4 mm con osteotomía sagital bilateral, y retroceso del mentón en su posición original con osteotomía en Z, mejorando la armonía del mentón. Hubo una mejora en perfil y en la estética de la paciente, como también una mejora en el perfil, estética y funcionalidade, con diminución del mentón. La cirúrgia ortognática permitió el movimiento de la mandíbula, reposicionamiento maxilar y además fue posible retroceder el mentón, obteniendo la corrección del perfil Clase II y de la mordida abierta anterior. El resultado representa una mejora del perfil y de la estética facial, además se nota una estabilidad esquelética, con restablecimiento de la función, autoestima y calidad de vida.

RESUMO Infecções por Ehrlichia em bovinos são frequentes na África, mas também foram relatadas no Brasil e na América do Norte. Este artigo relata uma infecção natural por Ehrlichia sp. associado a Babesia bigemina e Anaplasma marginale em um bezerro, no município de Campo Grande, Mato Grosso do Sul, Brasil, o qual apresentava polioencefalomalácia. A evidência molecular, baseada em um fragmento do gene dsb, indica uma espécie de Ehrlichia geneticamente relacionada a Ehrlichia canis e outras espécies do gênero encontradas no carrapato Rhipicephalus (Boophilus) microplus e em um bezerro do Brasil (99 a 100% de identidade). Não foi possível associar os sinais clínicos à infecção por Ehrlichia devido a coinfecções e evidências histológicas de outra doença. No entanto, a circulação da bactéria em bovinos no Cerrado brasileiro foi confirmada, e mais atenção deve ser dada à suspeita clínica de patógenos transmitidos por carrapatos em bovinos para esclarecer o potencial patogênico de Ehrlichia sp.

ABSTRACT Ehrlichia infections in cattle are frequent in Africa but have also been reported in Brazil and North America. This paper reports natural infection by Ehrlichia sp. associated with Babesia bigemina and Anaplasma marginale in a calf in the municipality of Campo Grande, state of Mato Grosso do Sul, Brazil, presenting polioencephalomalacia. The molecular evidence, based on a fragment of the dsb gene, indicates a species of Ehrlichia genetically related to Ehrlichia canis and other species of the genus found in the tick Rhipicephalus (Boophilus) microplus and a calf from Brazil (99 to 100% identity). It was not possible to associate the clinical signs with Ehrlichia infection due to co-infections and histological evidence of another disease. However, the circulation of the bacteria in bovines in Brazilian Cerrado was confirmed and more attention should be given to clinical suspicion of tick-borne pathogens in cattle to clarify the pathogenic potential of Ehrlichia sp.

ABSTRACT A semi-batch bubble reactor has been developed to produce fatty acid ethyl ester (biodiesel) by acid-catalyzed esterification of oleic acid with superheated ethanol vapor. In this paper, the effects of reaction temperature (110, 130 and 150°C), ethanol volumetric flow rate (1.35, 2.50 and 3.65 mL/min) and vapor bubble size on the reactor performance were evaluated. The results demonstrated that temperature and volumetric flow rate have significant effects on the chemical reaction, gas phase solubility and mass transfer limitations. In addition, the free fatty acid conversion velocity was increased by approximately 56% when a microporous stainless-steel tube was employed to generate and distribute the vapor bubbles inside the reactor, which allowed the process to reach 95% conversion in approximately 40 minutes for the operating temperature of 150°C and volumetric flow rate of 2.5 mL/min.

A pilot study has been performed in order to assess the validity and reliability of the Skindex-29 instrument, a self-administered report which evaluates the quality of life of argentine population with cutaneous conditions. The sample consisted of one-hundred and fifty subjects, one hundred were patients and fifty were not. Both the outcomes obtained and the subsampled comparisons turned out to be promising, with a high level of reliability and validity. This will allow to works with the same Instrument in different populations in order to confirm its stability.

Se ha realizado un estudio piloto para evaluar la confiabilidad y validez de la escala Skindex-29, una auto comunicación que evalúa la calidad de vida en personas que sufren afecciones dermatológicas en la población argentina. La muestra estuvo compuesta por 150 sujetos, 100 pacientes y 50 no pacientes. Los resultados obtenidos y las comparaciones por sub-muestras resultaron prometedores, con alta confiabilidad y validez, lo que permitirá continuar trabajando con la misma escala en diversas poblaciones, para corroborar la estabilidad de la misma.

Abstract: Epiploic appendicitis is a hemorrhagic infarction of an epiploic appendix, caused by a spontaneous twist or thrombosis. Usually the diagnosis is incidental in abdominal radiological studies performed for other causes of acute abdominal pain, its important to keep in mind entity, A correct diagnosis makes avoids hospitalization and surgery. Epiploic appendicitis usually resolves in 5-7 days. It is treated usually only with analgesics. Most cases are described in adults but in our institution is the second diagnosed case. CLINICAL CASE: We present a 9 year old male patient with a presumptive diagnosis of appendicitis. The definitive diagnos is was made with ultrasound tomography with which an omental appendicitis was documented. It was corroborated by pathologic examination. CONCLUSIONS: Our purpose is to describe the epiploic appendicitis in children as a cause of acute abdomen, as well as clinical, ultrasonographic, computed tomography and histopathology findings of this disease as a rare cause of acute abdomen. It is important to emphasize the value of imaging studies of this entity, in order to avoid unnecessary surgical procedure is known.

Resumen: ANTECEDENTE: la apendicitis epiploica es el infarto hemorrágico de un apéndice epiploico cuando existe torsión u ocurre una trombosis espontánea de su drenaje venoso central. Generalmente su diagnóstico es incidental en estudios radiológicos de abdomen que se realizan por otras causas de dolor abdominal. Clínicamente puede simular un cuadro de abdomen agudo, principalmente quirúrgico en niños. Por ello, es importante conocer esta entidad, ya que su diagnóstico correcto hace innecesaria la hospitalización y la cirugía. Por lo general, la apendicitis epiploica se resuelve espontáneamente en cinco a siete días y sólo requiere tratamiento con analgésicos. La mayoría de los casos han sido descritos en pacientes adultos; sin embargo, el caso que presentamos es el segundo diagnosticado en el Instituto Nacional de Pediatría. CASO CLÍNICO: niño de 9 años con diagnóstico clínico presuntivo de apendicitis, se diagnosticó por ultrasonido y tomografía computada como apendicitis epiploica, lo que se corroboró en la pieza anatomopatológica. CONCLUSIONES: nuestro propósito es describir la apendicitis epiploica en niños como causa de abdomen agudo, así como los hallazgos clínicos, ultrasonográficos, de tomografía computada e histopatológicos de esta patología como causa rara de abdomen agudo. Es importante que se conozca el valor de los estudios de imagen de esta entidad a fin de evitar tratamientos invasivos innecesarios.

Objective: The purpose was to investigate the factors related to aerobic fitness levels of adolescents in southern Brazil. Methods The sample consisted of 1081 students (545 males and 536 females), with mean age of 12.8 (± 1.2) years. This is a cross-sectional epidemiological study. Aerobic fitness was assessed by the 9-min running test. The independent variables analyzed were: age, socioeconomic status, school system (public/private), sedentary behavior, physical activity level, nutritional status and body adiposity. Analyses were stratified by sex. We used the Student "t" test for independent samples and logistic regression to estimate odds ratio (OR) and confidence intervals of 95% (95% CI). Results: The prevalence of low aerobic fitness levels was 92.5%. Boys aged 13-14 years were 2.44 times more likely to have low aerobic fitness levels; poorer boys were 4.31 times more likely to have low aerobic fitness levels. Girls aged 13-14 years were 5.35 times more likely to have low aerobic fitness levels; poorer girls were 10.70 times more likely to have low aerobic fitness levels; girls with sedentary behavior were approximately 4 times more likely to have low aerobic fitness levels. Conclusion: Thus, it was concluded that almost all adolescents show low aerobic fitness levels, which makes necessary effective interventions in the school environment with the promotion of sports and regular practice of physical activity.

Objetivo O objetivo foi investigar os fatores relacionados aos níveis de aptidão aeróbia dos adolescentes no Sul do Brasil. Métodos: A amostra foi constituída por 1081 estudantes (545 do sexo masculino e 536 do sexo feminino), com idade média de 12.8 (± 1.2) anos. Este é um estudo epidemiológico transversal. Aptidão aeróbica foi avaliada pelo teste de corrida de 9 minutos. As variáveis independentes analisadas foram: idade, nível socioeconômico, sistema de escola (pública/privada), comportamento sedentário, nível de atividade física, estado nutricional e adiposidade corporal. As análises foram estratificadas por sexo. Foi utilizado o teste de Student "t" para amostras independentes e regressão logística para estimar odds ratio (OR) e intervalos de confiança de 95% (CI95%). Resultados: A prevalência de baixos níveis de aptidão aeróbia foi de 92.5%. Meninos com idades entre 13-14 anos foram 2.44 vezes mais propensos a ter baixos níveis de aptidão aeróbia; meninos mais pobres eram 4.31 vezes mais propensos a ter baixos níveis de aptidão aeróbia. Meninas com idades entre 13-14 anos foram 5.35 vezes mais propensos a ter baixos níveis de aptidão aeróbia; as moças pobres foram 10.70 vezes mais propensas a ter baixos níveis de aptidão aeróbia; Meninas com comportamento sedentário foram aproximadamente 4 vezes mais propensas a ter baixos níveis de aptidão aeróbia. Conclusão: Assim, concluiu-se que quase todos os adolescentes apresentam baixos níveis de aptidão aeróbica, o que faz intervenções eficazes no ambiente escolar com a promoção do desporto e da prática regular de atividade física necessária.

Objetivo: El presente estudio tuvo como objetivo investigar los factores relacionados con los niveles de aptitud aeróbica de los adolescentes en el sur de Brasil. Métodos: La muestra estuvo conformada por 1081 alumnos (545 varones y 536 mujeres), con edad media de 12.8 (± 1.2) años. Se trata de un estudio epidemiológico transversal. La condición física aeróbica se evaluó mediante Test de Caminata de 9 minutos. Las variables independientes analizadas fueron: edad, nivel socioeconómico, el sistema escolar (público/privado), el sedentarismo, el nivel de actividad física, el estado nutricional y la adiposidad corporal. Los análisis fueron estratificados por sexo. Se aplicó la prueba de "t" Student para muestras independientes y regresión logística para estimar la odds ratio (OR) y los intervalos de confianza de 95% (IC95%). Resultados: La prevalencia de bajos niveles de aptitud aeróbica fue de 92.5%. Los niños de edades de 13 a 14 años fueron 2.44 veces más propensos a tener bajos niveles de condición física aeróbica; los niños más pobres fueron 4.31 veces más propensos a tener bajos niveles de condición física aeróbica. Las niñas de 13 a 14 años fueron 5.35 veces más propensas, a tener bajos niveles de condición física aeróbica; las niñas más pobres eran 10.70 veces más propensas a tener bajos niveles de condición física aeróbica; las niñas con el comportamiento sedentario, fueron aproximadamente 4 veces más propensas a tener bajos niveles de condición física. Conclusión: Se concluyó que casi todos los adolescentes muestran bajos niveles de condición física aeróbica, lo que hace necesarias intervenciones eficaces en el ámbito escolar para la promoción del deporte y la práctica regular de actividad física.

Resumo Na Amazônia brasileira dois gêneros mono-específicos, Harpia e Morphnus, caracterizam-se por baixa densidade e estão classificados pelo IUCN como Quase Ameaçados, porém ocorrem sobre grande parte do território nacional, suas principais ameaças são a fragmentação florestal, a degradação de hábitat e a caça. Neste estudo avaliamos a abundância destas duas grandes aves de rapina utilizando a base de dados dos programas ambientais da UHE Belo Monte, integrando-se dois métodos para construir um mapa de distribuição ao longo de 245 km do rio Xingu. Os levantamentos terrestres pelo método RAPELD mostraram-se mais eficientes para os registros de grandes águias quando comparado aos esforços padronizados aquáticos, entretanto estes foram complementares na ausência de módulos. Cinquenta e tres por cento foram registros ocasionais durante a supressão da vegetação, afugentamento ou deslocamento. Entre 2012-2014 quatro harpias foram removidas da natureza, dois indivíduos alvo de disparos, uma por colisão com rede elétrica, e outra por atropelamento. Sete ninhos mapeados, a distância média entre os registros de harpia na calha e margens do rio foi de 15 km, 20 km distância média entre ninhos, o que permitiu estimar um total de 20 casais utilizando as florestas aluviais em uma distancia de 270 km, incluindo matas ciliares e os fragmentos fora da margem do rio. Estimamos que territórios de outros 10 casais usando a Volta Grande longe do rio principal também serão afetados pela inundação. A distância média entre os registros de Morphnus foi 16 km ao longo do rio, o único ninho mapeado estava distante 1.3 km do ninho de Harpia. Estes fragmentos florestais estão sendo substituídos por pastagens, ressaltando-se a importância da manutenção das áreas de preservação permanentes (APP) e a proteção destes fragmentos em diversos formatos de áreas de proteção, para diminuir a degradação dos mesmos e garantir a manutenção das populações destes grandes predadores na região do rio Xingu.

Abstract In the Brazilian Amazon, two monospecific genera, the Harpy Eagle and Crested Eagle have low densities and are classified by IUCN as Near Threatened due to habitat loss, deforestation, habitat degradation and hunting. In this study, we evaluate occurrence of these large raptors using the environmental surveys database from Belo Monte Hydroelectric Power Plant. Integrating the dataset from two methods, we plotted a distribution map along the Xingu River, including records over a 276-km stretch of river. Terrestrial surveys (RAPELD method) were more efficient for detecting large raptors than standardized aquatic surveys, although the latter were complementary in areas without modules. About 53% of the records were obtained during activities of wildlife rescue/flushing, vegetation suppression or in transit. Between 2012 and 2014, four Harpy Eagles were removed from the wild; two shooting victims, one injured by collision with power lines and one hit by a vehicle. Also, seven nests were mapped. The mean distance between Harpy Eagle records was 15 km along the river channel, with a mean of 20 km between nests near the channel, which allowed us to estimate 20 possible pairs using the alluvial forest, riverine forest and forest fragments. Territories of another ten pairs will probably be affected by inundation of the Volta Grande channel, which is far from the main river. The average distance between Crested Eagle records was 16 km along the river channel. The only nest found was 1.3 km away from a Harpy Eagle nest. The remnant forests are under threat of being replaced by cattle pastures, so we recommend that permanently protected riparian vegetation borders (APP) be guaranteed, and that forest fragments within 5 km of the river be conserved to maintain eagle populations.

A 48-years old woman with an unusual clinical variant of dermatofibroma, the giant type is reported, the clinical aspect showed a polipoid lesion, firm and asymptomatic. The inflammatory nature of the dermatofibroma and the faces of the live of the lesions are emphasized.

Comunicamos el caso de una paciente de 48 años, con una infrecuente variante clínica de dermatofibroma, el gigante, siendo además polipoideo y localizado en palma. Enfatizamos el carácter inflamatorio del dermatofibroma y la importancia de conocer las etapas cronológicas de la lesión.

In the section of Psychodermatology, in the Dermatology Service of I. Pirovano Hospital, we look at the physician-patient relationship as the fundamental base of our work. We consider the subjectivity of each patient complain as an interpersonal bond in which one of the persons (the patient) seeks help, knowledge and care, while the other (the physician) offers his expertise accordingly. In some cases, this way of working results useful and essential. For example, when patients appear with self-injury, such as the one introduced by Dr. Gabriela Oliveira in the health center in which she works (besides belonging to our Dermatology Department), in the province of Buenos Aires. Self-injury is defined as a deliberate and repetitive act which seeks to harm one's body, without suicidal intention. Cutting, hiting and burning are the most common methods and the disorder is also known as self-harm or self-cutting. This condition is expressed in the skin, as we will observe in the adolescent patient presented, must be vigilant to dermatologists, general practitioners and those working in call duty doctors, given that this is an increasingly common psychiatric disorder among young people to achieve mental health referral and appropriate treatment, according to the underlying psychiatric disease.

En el sector de Psicodermatología, del Servicio de Dermatología del Hospital Ignacio Pirovano, tomamos como base fundamental de nuestro trabajo la relación médico-paciente. Es por ello, que consideramos la sujetividad de cada paciente que nos consulta y establecemos un vínculo interpersonal, en el que una de las personas (el paciente) busca recibir ayuda, conocimientos y cuidados, mientras que la otra (el médico) ofrece al paciente sus conocimientos y cuidados acordes a su patología. En algunos casos, esta forma de trabajar se vuelve no solo útil, sino esencial, por ejemplo: cuando se presentan pacientes con lesiones por auto-injuria, como la que se presentó en el centro de salud en la provincia de Buenos Aires, donde una de las autoras (GO) se desempeña como médica de guardia, además de pertenecer a nuestro Servicio de Dermatología. La auto-injuria se define como un acto deliberado y repetitivo que persigue dañar el propio cuerpo sin intención suicida, siendo los métodos más frecuentes los cortes, golpes y quemaduras¹. Este trastorno es conocido también como: autodaño, lesiones auto-inflingidas o auto-mutilación (self-injury, self-harm, self cutting). Este trastorno que se expresa en la piel, tal como observamos en la paciente adolescente que presentamos, debe mantenernos atentos a los médicos dermatólogos, generalistas y aquellos que trabajen en servicios de guardia, dado que estamos ante un trastorno psiquiátrico cada vez más frecuente entre los jóvenes, para poder lograr la derivación a Salud Mental y un adecuado tratamiento, según la patología psiquiátrica subyacente.

We report a case of vulvar location pyoderma gangrenosum, in a 45 years-old woman, corresponding to a classical variant (ulcerous) idiopathic, to date.

Comunicamos un caso de pioderma gangrenoso de localización vulvar, en una mujer de 45 años, correspondiendo a una variante clásica (ulcerosa) idiomática, hasta la fecha.

A 12 years-old girl with many anetoderma scars following molluscum contagiosum infection was reported, this unusual dermatosis residual to molluscum contagiosum are difficult to treat.

Comunicamos un caso de anetodermia secundaria a la infección por moluscos contagiosos, en una niña de 12 años de edad, secuela infrecuente pero de difícil tratamiento.