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Abstract Reactive perforating collagenosis is a rare perforating dermatosis clinically characterized by intensely pruritic hyperpigmented papules, plaques, and nodules with a central keratotic plug. Histopathology reveals transepidermal elimination of collagen fibers. Its pathophysiology is still under investigation, but the acquired form has been linked to systemic conditions such as diabetes mellitus and chronic kidney disease. However, it has also been described as a paraneoplastic syndrome. The authors present the case of a 65-year-old diabetic patient in which a myeloproliferative neoplasm was suspected.

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Reactive perforating collagenosis is a rare perforating dermatosis clinically characterized by intensely pruritic hyperpigmented papules, plaques, and nodules with a central keratotic plug. Histopathology reveals transepidermal elimination of collagen fibers. Its pathophysiology is still under investigation, but the acquired form has been linked to systemic conditions such as diabetes mellitus and chronic kidney disease. However, it has also been described as a paraneoplastic syndrome. The authors present the case of a 65-year-old diabetic patient in which a myeloproliferative neoplasm was suspected.

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INTRODUCTION: Adrenal masses are uncommon in newborns. The differential diagnosis includes be nign masses (adrenal hemorrhage, extralobar pulmonary sequestration) and malignant ones (neuro blastoma) that may be a finding during an obstetric ultrasound. The use of complementary imaging methods allows a better diagnosis approach during the postnatal period, with implications for the management of these patients. OBJECTIVE: To report the case of a female newborn with diagnosis of an adrenal mass, and to discuss differential diagnoses and management alternatives of adrenal lesions in newborns. CASE REPORT: Two-month-old female infant, referred for adrenal tumor study diagnosed at 22 weeks gestational age. Postnatal ultrasound showed a tumor compatible with neuroblastoma. The patient was asymptomatic, and the laboratory studies showed no relevant findings. The lesion was excised by laparoscopy. A histological study confirmed pulmonary sequestration. CONCLUSIONS: Extralobar pulmonary sequestration should be considered in the differential diagnosis of an adrenal mass in the newborn. Minimally invasive surgery should be the preferred surgical technique choice in these cases, given the technical feasibility and benefits in the recovery and cosmetic issues of the patient.

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Resumen: Introducción: Las masas suprarrenales en recién nacidos son infrecuentes. El diagnóstico diferen cial incluye masas benignas (hemorragia suprarrenal o secuestro pulmonar extralobar) y malignas (neuroblastoma), y pueden ser un hallazgo durante la ecografía obstétrica. El uso de imágenes com plementarias en el periodo postnatal permite una mejor aproximación diagnóstica, con implicancias en el manejo de estos pacientes. Objetivos: comunicar el caso de una recién nacida portadora de una masa suprarrenal, discutir los diagnósticos diferenciales y el manejo de lesiones suprarrenales en recién nacidos. Caso Clínico: Lactante de 2 meses de edad, derivada para estudio de tumor supra rrenal de diagnóstico antenatal a las 22 semanas de edad gestacional. El estudio imagenológico con ecografía postnatal mostró un tumor compatible con neuroblastoma. Paciente asintomática, estudios de laboratorios sin hallazgos relevantes. Se realizó resección laparoscópica de la lesión. El estudio histológico confirmó un secuestro pulmonar. Conclusión: El secuestro pulmonar extralobar debe ser considerado en el diagnóstico diferencial de una masa suprarenal del recién nacido. La cirugía mínimamente invasiva debiera considerarse como el abordaje de elección en casos como este, donde existe factibilidad técnica y beneficios en la recuperación y secuelas cosméticas del paciente.

Abstract: Introduction: Adrenal masses are uncommon in newborns. The differential diagnosis includes be nign masses (adrenal hemorrhage, extralobar pulmonary sequestration) and malignant ones (neuro blastoma) that may be a finding during an obstetric ultrasound. The use of complementary imaging methods allows a better diagnosis approach during the postnatal period, with implications for the management of these patients. Objective: To report the case of a female newborn with diagnosis of an adrenal mass, and to discuss differential diagnoses and management alternatives of adrenal lesions in newborns. Case report: Two-month-old female infant, referred for adrenal tumor study diagnosed at 22 weeks gestational age. Postnatal ultrasound showed a tumor compatible with neuroblastoma. The patient was asymptomatic, and the laboratory studies showed no relevant findings. The lesion was excised by laparoscopy. A histological study confirmed pulmonary sequestration. Conclusions: Extralobar pulmonary sequestration should be considered in the differential diagnosis of an adrenal mass in the newborn. Minimally invasive surgery should be the preferred surgical technique choice in these cases, given the technical feasibility and benefits in the recovery and cosmetic issues of the patient.

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Cutaneous larva migrans is a common infestation among travelers. Although the diagnosis may be suspected clinically, cases can show atypical presentations. We present the ultrasound features of 4 cases at 18 and 70 MHz. Small linear hyperechoic and hyper-refringent subepidermal and intrafollicular structures suggestive of fragments of larvae, hypoechoic dermal and hypodermal tunnels that match with dilatation of lymphatic ducts, and inflammatory dermal and hypodermal ultrasound signs can support the diagnosis. This work suggests that larvae can penetrate the cutaneous basement membrane through the ostia of the hair follicles and potentially disseminate through the dermal and hypodermal lymphatic network.

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Abstract: Autoimmune progesterone dermatitis is an uncommon, poorly recognized and under-diagnosed catamenial dermatosis associated with hypersensitivity reactions to progestagens. Most cases manifest as urticaria, eczema or erythema multiforme-like. A 26-year-old woman developed violaceous plaques on the groin and abdomen, 4 days after a spontaneous abortion resolved with uterine curettage. The lesions recurred once monthly at the same sites, mimicking a fixed drug eruption. Although the histopathology was compatible with fixed drug eruption, positive intradermal testing and symptomatic improvement after using oral contraceptive pills gave us a clue to the diagnosis.

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Autoimmune progesterone dermatitis is an uncommon, poorly recognized and under-diagnosed catamenial dermatosis associated with hypersensitivity reactions to progestagens. Most cases manifest as urticaria, eczema or erythema multiforme-like. A 26-year-old woman developed violaceous plaques on the groin and abdomen, 4 days after a spontaneous abortion resolved with uterine curettage. The lesions recurred once monthly at the same sites, mimicking a fixed drug eruption. Although the histopathology was compatible with fixed drug eruption, positive intradermal testing and symptomatic improvement after using oral contraceptive pills gave us a clue to the diagnosis.

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La Histiocitosis de Células de Langerhans (HCL) es una neoplasia mieloide de las células dendríticas Langerhans (CDL), caracterizada por acúmulos de células dendríticas mieloides CD207+. Corresponden a un espectro de enfermedades, desde sólo cutáneas a variantes multiorgánicas. El objetivo de este reporte es describir el caso clínico de un paciente pediátrico, con diagnóstico de Histiocitosis de Células de Langerhans, enfatizando el algoritmo clínico. Paciente masculino de 1 año y 5 meses, con antecedentes de otorrea persistente, refractaria a tratamiento, de un año de evolución. Consulta en policlínico de dermatología por "dermatitis severa" desde hace 1 año. Al examen físico se constatan lesiones tipo dermatitis seborreica generalizadas en tronco y cuero cabelludo, intertrigo fisurado, pápulas eritemato-costrosas plantares con petequias y pus en conducto auditivo externo bilateral. Presenta Hemoglobina 9,5 mg/dl, Hematocrito31,9%, leucocitos 12.400, linfocitos 33,3%, plaquetas 920.000, VHS 27. Subpoblaciones linfocitarias: CD3: 34,7%, C4: 22,7%, CD8: 9,7%, CD19:47,8%. HTLV negativo, VIH negativo. Acaro-test negativo. Dermatopatología: Denso infiltrado de células linfomonocíticas en dermis papilar, con ensanchamiento de estas y gran epidermotropismo, con abundante citoplasma eosinófilo con núcleos arriñonados, CD1a y langerina positivo. Recomendamos elevar la sospecha diagnóstica ante un cuadro de dermatitis seborreica generalizada que esta fuera del rango etario característico y en casos de dermatitis refractarias, donde a pesar de un adecuado tratamiento médico, el paciente persiste comprometido.

Langerhans Cell Histiocytosis (HCL) is a myeloid neoplasm of Langerhans dendritic cells (CDL), characterized by accumulations of myeloid dendritic cells CD207 +. They correspond to a spectrum of diseases, from cutaneous to multi-organ variants. The objective of this report is to describe the clinical case of a pediatric patient with diagnosis of, emphasizing the clinical algorithm. Male patient,1 year and 5 months old, with a history of refractory persistent otorrhea, consulted because of long term severe dermatitis. Physical examination revealed generalized seborrheic dermatitis lesions on the trunk and scalp, cleft intertrigo, plantar erythematous-crusted papules with petechiae, and pus in the external auditory canal. Laboratory findings showed: Hemoglobin 9.5 mg / dl, Hematocrit: 31.9%, leukocytes: 12,400, lymphocytes 33.3%, platelets: 920,000, HSV 27. Lymphocyte subpopulations: CD3: 34.7%, C4: 22.7%, CD8: 9.7%, CD19: 47.8%. HTLV negative, HIV negative. Scabies Negative. Dermatopathology: Dense infiltrate of lymphomonocytic cells in the papillary dermis with widening of the papilla and large epidermotropism, cells show abundant eosinophilic cytoplasm with "kidney nuclei", CD1a and langerin were positive. We recommend elevating the diagnostic suspicion in the face of a generalized seborrheic dermatitis that is outside the characteristic age range and in cases of refractory dermatitis, where the patient persists compromised.

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Fever of unknown origin (FUO) is defined as fever over 7 to 10 days without a diagnosis despite a complete initial study. The most frequent causes are infections, autoimmune and tumors. Even though most cases are self-limited there is a minority that has an underlying etiology with an ominous forecast, encouraging a systematized study. OBJECTIVE: To report a rare case of a boy who presented fever of unknown origin associated to panniculitis and was diagnosed of subcutaneous panniculitis-like-T cell lymphoma and to emphasis the importance of a sequential study of FUO, in order to reach a diagnosis in patients who need a timely intervention. CLINICAL CASE: A ten year old boy, previously healthy, presented subcutaneous nodular lesions of 2 month of evolution, located in abdominal region and extremities, given few symptoms, associated with prolonged fever. He was hospitalized for proper study, in first instance infectious and immune causes were discarded and through lesions biopsy the diagnose of subcutaneous panniculitis-like-T cell lymphoma was reached. CONCLUSION: When FUO is diagnosed, most prevalent causes must be discarded. Then, differential diagnosis, such as immune and neoplasic etiologies, have to be considered. If FUO is associated to elemental nodular lesions, biopsy must be indicated early, in order to find potential malignant cases, avoiding therapeutic delay.

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