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Um paciente canino, da raça Golden Retriever, foi atendido em clínica veterinária particular, com uma extensa formação nodular cutânea em região ventro-lateral direita, com evolução de um ano. A lesão apresentava consistência mole e presença de nodulações sólidas e retilíneas no seu interior, entremeadas ao meio líquido. Foi realizada colheita do material, por meio de punção por aspiração com agulha fina e o resultado citopatológico foi inconclusivo para neoplasia. Não foram observadas alterações dignas de nota na ultrassonografia abdominal. Após a realização de tomografia computadorizada da formação cutânea, as imagens eram compatíveis com abscesso ou hematoma entre áreas de mineralização. O animal foi submetido ao procedimento cirúrgico para biópsia excisional, tendo como diagnóstico morfológico paniculite nodular estéril com esteatonecrose, processo de morte celular dos adipócitos. O procedimento cirúrgico foi considerado curativo, uma vez que após um ano não houve recidiva no local ou formação de outras nodulações cutâneas. Essa patologia é incomum em cães, principalmente da raça Golden Retrevier e em região abdominal do tecido subcutâneo. Embora sejam correlacionadas algumas hipóteses, a causa dessa patologia permanece idiopática.(AU)

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RESUMEN Introducción: el eritema nudoso es la variante clínico-patológica más frecuente de la paniculitis. Es una reacción cutánea inmunológica en respuesta a un amplio espectro de agentes etiológicos. Objetivo: caracterizar el comportamiento clínico-epidemiológico del eritema nudoso. Materiales y métodos: se realizó un estudio descriptivo, prospectivo y longitudinal en pacientes con diagnóstico de eritema nudoso, ingresados en el Hospital Provincial Docente Clínico Quirúrgico León Cuervo Rubio, de Pinar del Río, en el período de enero de 2017 a diciembre de 2018. El universo estuvo constituido por 34 pacientes con diagnóstico clínico de eritema nudoso, hospitalizados en los servicios de Medicina Interna y Dermatología. Para la recogida de la información se utilizaron la historia clínica, el examen físico y los exámenes de laboratorio. Se utilizaron métodos teóricos, empíricos y estadísticos; de los últimos se empleó la estadística descriptiva a través de frecuencias absolutas y porcentaje. Resultados: el mayor grupo de pacientes estuvo entre 30 y 39 años, y fue del sexo femenino. Las lesiones fueron más frecuentes en los meses de invierno. El tipo de eritema nudoso idiopático prevaleció. Predominó el tiempo de evolución de 1 a 3 meses. Como causa secundaria predominaron las infecciones, y los tratamientos más usado fueron los antiinflamatorios no esteroideos. Conclusiones: se trata de una importante enfermedad de salud, cuyo un diagnóstico etiológico temprano permite un tratamiento adecuado. Resulta difícil su identificación y manejo tanto en la atención primaria como en la secundaria (AU).

ABSTRACT Introduction: erythema nodosum is the most common clinical-pathological variant of panniculitis. It is an immunological skin reaction in response to a wide spectrum of etiologic agents. Objective: to characterize the clinical-epidemiological behavior of erythema nodosum. Materials and methods: a descriptive, prospective and longitudinal study was carried out in patients with diagnosis of erythema nodosum, admitted to the Provincial Teaching Clinical Surgical Hospital León Cuervo Rubio, of Pinar del Río, in the period January 2017 to December 2018. The universe was formed by 34 patients with clinical diagnosis of erythema nodosum, hospitalized in the services of Internal Medicine and Dermatology. Medical records, physical examination and laboratory tests were used for the collection of information. Theoretical, empirical and statistical methods were used; descriptive statistics was used through absolute frequencies and percentage. Results: the largest group of patients was between 30 and 39 years, and they were female. Injuries were more frequent in the winter months. The type of idiopathic erythema nodosum prevailed. The time of evolution prevailed from 1 to 3 months. Infections predominated as a secondary cause, and the most commonly used treatments were non-steroidal anti-inflammatory drugs. Conclusions: it is an important health condition, whose early etiological diagnosis allows the proper treatment. Its identification and management in both primary and secondary care is difficult (AU).

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Abstract Intravascular large B-cell lymphoma is a rare, non-mass-forming, extranodal large B-cell lymphoma subtype characterized by the presence of tumor cells in the lumens of vessels. It is divided into two major types: classical and Asian. Patients presenting only with skin involvement are mostly female, at a younger age than classical intravascular large B-cell lymphoma patients, and have a better prognosis. Since the diagnosis of cases with isolated skin involvement is difficult, keeping this entity in mind, performing a careful microscopic examination, and applying new, effective treatment regimens will make it possible to achieve better clinical outcomes in these cases.

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Intravascular large B-cell lymphoma is a rare, non-mass-forming, extranodal large B-cell lymphoma subtype characterized by the presence of tumor cells in the lumens of vessels. It is divided into two major types: classical and Asian. Patients presenting only with skin involvement are mostly female, at a younger age than classical intravascular large B-cell lymphoma patients, and have a better prognosis. Since the diagnosis of cases with isolated skin involvement is difficult, keeping this entity in mind, performing a careful microscopic examination, and applying new, effective treatment regimens will make it possible to achieve better clinical outcomes in these cases.

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Target therapies are currently a therapeutic option increasingly used for the management of patients with metastatic melanoma. However, there are multiple adverse pharmacological effects associated with their use that have been described. Cutaneous adverse reactions are the most frequent. We report the case of a 55-year-old man with a diagnosis of stage IV BRAFV600E-mutated metastatic cutaneous melanoma undergoing treatment with dabrafenib/trametinib, who consulted due to the development of erythematous nodular lesions in the upper and lower limbs associated with febrile sensation during the course of treatment. Infection was ruled out and a biopsy of the skin lesions was done, which provided the histopathological confirmation of a predominantly septal, granulomatous with leukocytoclastic vasculitis, mixed panniculitis. Panniculitis associated with this therapy has been described in the literature and has been considered an immune-mediated pharmacological adverse effect. It is considered to be related to a better prognosis in the treatment of metastatic melanoma. Consequently, as shown in this case report, target therapy should not be discontinued and symptomatic medication should be given to alleviate patient discomfort. The dermatologist should know and properly interpret this adverse effect and prescribe the most appropriate management for the patient.

Las terapias target constituyen hoy en día una alternativa terapéutica cada vez más utilizada para el manejo de pacientes con melanoma metastásico. Sin embargo, se han descrito múltiples efectos farmacológicos adversos asociados a su uso, siendo los cutáneos los de mayor prevalencia. Se presenta el caso de un hombre de 55 años con diagnóstico de melanoma cutáneo metastásico etapa IV, BRAFV600E mutado, en tratamiento con dabrafenib/trametinib que consultó por desarrollo de lesiones nodulares eritematosas sensibles en extremidades superiores e inferiores, asociadas a sensación febril durante el curso del tratamiento. Se descartó alguna infección sobreagregada. Se realizó una biopsia de las lesiones cutáneas, con confirmación diagnóstica histopatológica de una paniculitis mixta de predominio septal, granulomatosa y con vasculitis leucocitoclástica. La paniculitis asociada a esta terapia ha sido descrita en la literatura y se ha considerado un efecto farmacológico inmunomediado adverso, relacionándose a un mejor pronóstico para el melanoma metastásico en tratamiento. Por lo tanto, así como en el caso presentado, se evita la suspensión del fármaco y se asocia terapia sintomática en caso de mayores molestias del paciente. Es de alta relevancia para el dermatólogo conocer e interpretar adecuadamente este efecto adverso farmacológico, y así indicar el manejo más adecuado para el paciente.

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INTRODUCTION: Panniculitis is a group of diseases that affect subcutaneous fat tissue and clinically manifest as nodules. Its pathogenesis is not entirely clear, and it is usually asymptomatic. The confirma tory diagnosis is histological. OBJECTIVE: To describe the clinical and histopathological characteristics of a case of fat necrosis, a specific form of panniculitis in the newborn (NB). CLINICAL CASE: 40-week female NB, born by emergency cesarean section due to fetal tachycardia with meconium, Apgar score 7-8-9. She required oxygen and positive pressure for five minutes. On the fifth day of life, she presen ted an increased volume in the posterior trunk region, with an erythematous - purplish discoloration, which is soft and non-tender to palpation. Skin and soft tissues ultrasound showed increased echo genicity of the subcutaneous cellular tissue and loss of definition of the adipocytes of 42.3 x 9.7 x 20.1 mm approximately, without vascularization. Skin biopsy showed epidermis with irregular acanthosis and basket-weave orthokeratosis; papillary dermis with inflammatory infiltrate, and reticular dermis and adipose tissue with presence of lymphohistiocytic infiltrate with a tendency to form nodules, without vascular involvement, and small cholesterol deposits, compatible with subcutaneous fat ne crosis (SBFN) of the newborn. The patient at three months of age had complete regression of the lesion. CONCLUSIONS: a clinically and histologically compatible case with SBFN is described, that did not present complications during observation. In general, this pathology has a good prognosis, with spontaneous resolution as in our case.

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Resumen: Introducción: Las paniculitis constituyen un grupo de enfermedades que afectan al tejido graso subcutáneo y se manifiestan clínicamente como nódulos. Su patogenia no es del todo clara, por lo general es asintomático. El diagnóstico confirmatorio es histológico. Objetivo: describir las características clínicas e histopatológicas de un caso de necrosis grasa, una forma especifica de paniculitis en el recién nacido (RN). Caso Clínico: RN femenino de 40 semanas, parto cesárea de urgencia por taqui cardia fetal más meconio, APGAR 7-8-9. Requirió oxigeno y presión positiva por 5 min. Al quinto día de vida presentó aumento de volumen en tronco posterior, de coloración eritematosa - violácea, remitente a la palpación, no doloroso. Ecotomografría de piel y partes blandas informó aumento de la ecogenecidad del tejido celular subcutáneo y pérdida de definición de las celdillas adiposas de aproximadamente 42.3 x 9.7 x 20.1 mm, sin presencia de vascularización. Biopsia de piel: epidermis con acantosis irregular y ortoqueratosis en cestas; dermis papilar con infiltrado inflamatorio y dermis reticular y tejido adiposo con presencia de infiltrado linfohistocitiario con tendencia a la formación de nódulos, sin compromiso vascular, leves depósitos de colesterol; compatible con necrosis grasa del recién nacido (NGRN). Paciente tuvo regresión completa de la lesión a los tres meses de vida. Conclusiones: se describe un caso compatible clínica e histológicamente con NGRN; sin complica ciones durante su observación. Por lo general esta patología tiene buen pronóstico, con resolución espontánea, como en nuestro caso.

Abstract: Introduction: Panniculitis is a group of diseases that affect subcutaneous fat tissue and clinically manifest as nodules. Its pathogenesis is not entirely clear, and it is usually asymptomatic. The confirma tory diagnosis is histological. Objective: To describe the clinical and histopathological characteristics of a case of fat necrosis, a specific form of panniculitis in the newborn (NB). Clinical Case: 40-week female NB, born by emergency cesarean section due to fetal tachycardia with meconium, Apgar score 7-8-9. She required oxygen and positive pressure for five minutes. On the fifth day of life, she presen ted an increased volume in the posterior trunk region, with an erythematous - purplish discoloration, which is soft and non-tender to palpation. Skin and soft tissues ultrasound showed increased echo genicity of the subcutaneous cellular tissue and loss of definition of the adipocytes of 42.3 x 9.7 x 20.1 mm approximately, without vascularization. Skin biopsy showed epidermis with irregular acanthosis and basket-weave orthokeratosis; papillary dermis with inflammatory infiltrate, and reticular dermis and adipose tissue with presence of lymphohistiocytic infiltrate with a tendency to form nodules, without vascular involvement, and small cholesterol deposits, compatible with subcutaneous fat ne crosis (SBFN) of the newborn. The patient at three months of age had complete regression of the lesion. Conclusions: a clinically and histologically compatible case with SBFN is described, that did not present complications during observation. In general, this pathology has a good prognosis, with spontaneous resolution as in our case.

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BACKGROUND: Weber-Christian disease is a recurrent, non-suppurative, febrile nodular panniculitis, more frequent in young women. It is characterized by recurrent outbreaks of subcutaneous nodules, distributed symmetrically. It has an idiopathic origin, or it is secondary to pancreatic disease, physicochemical agents or alpha-1 antitrypsin deficiency. It can affect any tissue with body fat. Histologically is a lobular panniculitis without vasculitis. CASE REPORT: 23-year-old woman. She was admitted with subcutaneous painful nodules in pelvic, gluteus and forearms, with erythematous and hyperpigmented plaques; ecchymosis in the right upper eyelid and bilateral hyposphagma; fever of 38 °C; diaphoresis and oral ulcers, not painful. The hemogram showed pancytopenia, elevation of acute phase reagents, amylase and normal lipase. Blood culture was negative. Antinuclear antibodies and complement were normal. Computed tomography of the abdomen showed disseminated hyperdensity in subcutaneous tissue. The biopsy showed lobular panniculitis without vasculitis compatible with WeberChristian panniculitis. The patient was treated with steroids and immunosuppressive therapy. CONCLUSIONS: Infectious etiology and other causes of erythematous nodules were ruled out through clinical evolution and complementary studies. The patient presented spontaneous involution in several weeks and sometimes the lesions evolved to sterile abscesses, in addition to systemic clinical manifestations. Corticosteroid therapy was deemed successful.

INTRODUCCIÓN: La enfermedad de Weber-Christian es una paniculitis nodular recidivante, no supurativa, febril, más frecuente en las mujeres jóvenes. Se caracteriza por brotes recurrentes de nódulos subcutáneos, de distribución simétrica. Tiene un origen idiopático o es secundaria a enfermedad pancreática, agentes fisicoquímicos o déficit de alfa-1-antitripsina. Puede afectar cualquier tejido del organismo que tenga grasa. Histológicamente presenta paniculitis lobulillar sin vasculitis. CASO CLÍNICO: Mujer de 23 años que ingresó por nódulos subcutáneos dolorosos con equimosis en miembros pélvicos, glúteos y antebrazos, con placas eritematosas e hiperpigmentadas; equimosis en párpado superior derecho e hiposfagma bilateral; fiebre de 38 °C; diaforesis y úlceras orales no dolorosas. El hemograma mostró pancitopenia, elevación de los reactantes de fase aguda, y amilasa y lipasa normales. Los cultivos fueron negativos. Los anticuerpos antinucleares y el complemento fueron normales. La tomografía del abdomen presentó hiperdensidad en tejido graso subcutáneo diseminada. La biopsia reveló paniculitis lobulillar sin vasculitis, compatible con paniculitis de Weber-Christian. Se trató con esteroide e inmunosupresor. CONCLUSIONES: Se descartaron la etiología infecciosa y otras causas de nódulo eritematoso por la evolución clínica y los estudios complementarios. La paciente presentó en varias semanas una involución espontánea; en ocasiones, las lesiones evolucionaron a abscesos estériles, además de manifestaciones clínicas sistémicas. El tratamiento corticoideo tuvo buen resultado.

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