Essential thrombocythemia manifesting as livedoid and purpuric skin lesions: Report of two cases and literature review.

Essential thrombocythemia is a chronic myeloproliferative syndrome which usually runs its course as an asymptomatic elevated platelet count. Cutaneous manifestations secondary to microcirculation abnormalities are rare but can represent a helpful diagnostic clue in order to prevent major thromboembolic events. We report two cases of heterogeneous livedoid and "net-like" skin lesions in the context of essential thrombocythemia with identical histopathologic findings (medium-sized blood vessels with luminal obliteration by eosinophilic material, mostly positive for the platelet marker CD61, without vasculitis). In conclusion, we seek to raise awareness of the clinicopathological features of essential thrombocythemia to allow for prompt diagnosis and treatment.

Real-world outcomes in patients with malignancy and moderate-to-severe psoriasis treated with guselkumab.

Background: The treatment of psoriasis in patients with a personal history of cancer is a matter of debate and limited evidence is available to guide clinicians. Objectives: To report a multicenter real-life experience of a group of patients with psoriasis undergoing treatment with guselkumab and a history of cancer. Methods: We conducted a multicenter retrospective Spanish study enrolling patients with moderate-to-severe plaque psoriasis and neoplasia being treated with guselkumab for their psoriasis. Results: Twenty patients with moderate-to-severe psoriasis and at least 12 weeks of ongoing treatment were included. For the analysis, a 52 week follow-up period was evaluated in terms of efficacy and safety. Most of the malignancies in these patients were solid tumors. The percentage of patients achieving psoriasis area and severity index ≤3 at week 12 and week 52 was 80% and 87.5%, respectively, whereas 68.8% of patients achieved psoriasis area and severity index ≤1. A 52-week survival rate of 100% in the study population was observed (n = 20), including those patients with concomitant active cancers (n = 14). No adverse effects or dropouts related to guselkumab safety profile were detected. Limitations: Modest sample size and the retrospective nature of the study. Conclusion: Guselkumab not only demonstrates high effectiveness in treating psoriasis but also exhibits a favorable safety profile in patients with neoplasms.

Presentación inusual de un penfigoide gestacional / Atypical presentation of pemphigoid gestationis

El penfigoide gestacional (PG) es una dermatosis ampollosa autoinmunitaria que generalmente aparece en el segundo y el tercer trimestres de la gestación, aunque no es infrecuente su debut en el puerperio inmediato. Clínicamente, consiste en la aparición de lesiones pruriginosas urticariformes y vesículo-ampollosas que comienzan, preferentemente, en el área periumbilical, con extensión centrífuga al resto de la superficie corporal. El PG está asociado a prematuridad y bajo peso. En el 5% de los casos los recién nacidos con madre con PG pueden presentar una erupción vesículo-ampollosa moderada debido al paso transplacentario de autoanticuerpos frente a inmunoglobulina G (IgG) maternos y que suele resolverse en poco tiempo. Presentamos el caso de una paciente puérpera con lesiones inicialmente acrales, con morfología similar a las del eritema exudativo multiforme, que posteriormente se extendieron a los brazos y las piernas y dieron lugar a grandes ampollas. El estudio histológico y la inmunofluorescencia directa fueron claves para el diagnóstico correcto y el posterior manejo terapéutico (AU)

Pemphigoid gestationis (PG) is an autoimmune blistering dermatosis that usually occurs in the second and third trimesters of pregnancy, although onset in the early puerperium is not infrequent. Clinically, this entity consists of pruritic urticarial blisters and vesicles that usually start in the periumbilical area and spread peripherally. PG is associated with prematurity and low birth weight. In 5% of cases, the neonates of mothers with PG may show moderate blistering-vesicular eruptions induced by autoantibodies transferred across the placenta, which usually resolve in a short time. We report the case of a puerperal patient who initially showed acral lesions with a morphology similar to those of exudative erythema multiforme, which subsequently spread to her arms, legs and face resulting in large blisters. Histological studies and direct immunofluorescence were essential to proper diagnosis and subsequent therapeutic management (AU)