Gianotti-Crosti syndrome-like reaction to molluscum contagiosum-Clinical characteristics and response to treatment.

BACKGROUND AND OBJECTIVES: Molluscum contagiosum (MC) is a common viral infection. Hypersensitivity reactions reminiscent of Gianotti-Crosti syndrome, termed Gianotti-Crosti syndrome-like reaction (GCLR), have been reported in a subset of patients. We report a series of patients with GCLR, better delineating its clinical presentation and course. PATIENTS AND METHODS: Retrospective chart review of all children presenting with GCLR at our Pediatric Skin Center between 2015 and 2020. RESULTS: 26 children (14 boys) with a median age of 6.5 (3-11.3) years were included. GCLR involved the extensor surfaces of the extremities in all patients. More widespread eruptions also affected the trunk and face in 7 (27 %) and 6 (23 %) children respectively. Involvement of the skin overlying the Achilles tendons was a new finding in 4 (15 %) children. Itch was the predominant symptom in 20 (77 %) patients. The rash responded to topical and/or systemic corticosteroids and resolved within four weeks. GCLR was followed by clearance of MC in all patients within 9 (4-24) weeks. CONCLUSIONS: GCLR is a characteristic acute, wide-spread, pruritic papular eruption, which often leads to emergency consultations and anxiety in affected patients. GCLR responds well to corticosteroid treatment, has a benign course, and heralds the healing of MC.

Gianotti-Crosti Syndrom-ähnliche Reaktion bei Molluscum contagiosum -Klinische Charakteristika und Therapieansprechen.

HINTERGRUND UND ZIELE: Molluscum contagiosum (MC) ist eine häufige Virusinfektion der Haut. Bei gewissen Patienten mit MC kann eine Hypersensitivitätsreaktion ähnlich des Gianotti-Crosti-Syndroms beobachtet werden. Diese wird Gianotti-Crosti syndrome-like reaction (GCLR, Gianotti-Crosti-Syndrom-ähnliche Reaktion) genannt. Wir berichten über eine Kohorte von Patienten mit GCLR, um deren klinische Präsentation und Verlauf besser zu charakterisieren. PATIENTEN UND METHODIK: Retrospektive Studie mit Einschluss aller Kinder, welche sich zwischen 2015 und 2020 mit einer GCLR in unserem pädiatrischen Hautzentrum vorgestellt haben. RESULTATE: 26 Patienten (14 männlich) mit einem medianen Alter von 6.5 (3-11,3) Jahren wurden eingeschlossen. Die GCLR hat bei allen Patienten die Streckseiten der Extremitäten betroffen. Bei Kindern mit ausgedehntem Ausschlag waren bei 7 (27 %) auch der Stamm und bei 6 (23 %) auch das Gesicht mitbetroffen. Der Befall der Haut über der Achillessehne war ein auffälliges Phänomen bei 4 (15 %) Kindern. Juckreiz war das vorherrschende Symptom bei 20 (77 %) Patienten. Der Ausschlag hat gut auf die Behandlung mit topischen und/oder systemischen Kortikosteroiden angesprochen und ist innerhalb von 4 Wochen abgeklungen. Bei allen Patienten folgte innerhalb von 9 (4-24) Wochen nach der GCLR die Abheilung der MC. SCHLUSSFOLGERUNGEN: GCLR ist ein charakteristischer, akuter, ausgedehnter, juckender papulöser Ausschlag und führt häufig zu Notfallkonsultationen und Verunsicherung der betroffenen Patienten. Die GCLR spricht gut auf eine Behandlung mit Kortikosteroiden an, hat einen gutartigen Verlauf und geht der Abheilung der MC voraus.

Getting started with taiji: investigating students expectations and teachers appraisals of taiji beginners courses.

In recent years, Taiji has been frequently investigated and considered as a stress management intervention. Although health care providers' appraisals and consumers' expectations are regarded as essential for treatment outcome, little attention has been drawn to this issue in Taiji research. In our study we have conducted two surveys to explore beginners' (n = 74) expectations and teachers' (n = 136) appraisals of their Taiji courses in general as well as more particularly related to stress management. Qualitative data analysis revealed that beginners mainly expected to learn a new method that is applicable in their daily life to foster peace of mind and to enhance their stress management. Congruently moderate-to-high improvements in stress management have also been found in quantitative analysis, whereby a lower educational level predicted higher expectations (P = 0.016). Taiji-teachers stated body- and mind-related benefits most frequently and appraised moderate-to-high improvements in stress management. Higher appraisals were predicted by a shorter teaching experience (P = 0.024). Our results inform about beginners' expectations and teachers' appraisals related to a Taiji-beginners course and highlight the role of educational background and teaching experience in shaping stress-management-related beginners' expectations and teachers' appraisals.

Characteristics of Dermatological Patients With Blood Eosinophilia: A Retrospective Analysis of 453 Patients.

BACKGROUND: Skin diseases associated with blood or tissue eosinophilia are common. Because these have various clinical manifestations, making the correct diagnosis can be challenging. So far, dermatological patients with concomitant blood eosinophilia have not been characterized. OBJECTIVE: To investigate patterns of dermatological patients with concomitant blood eosinophilia to obtain information helpful for optimizing disease management. METHODS: In this retrospective study, demographic and clinical data and diagnostic test results of all patients presenting with dermatoses associated with blood eosinophilia referred to a university center from 2014 to 2018 were extracted from the electronic patient charts and evaluated using descriptive and semantic map analyses. RESULTS: A total of 453 patients (51.4% females; mean age, 58.4 ± 21.7 years) were included and grouped according to blood absolute eosinophil counts: severe, greater than or equal to 1.5 G/L (n = 87; 19.2%); moderate, 1.0 to 1.49 G/L (n = 73; 16.1%); and mild eosinophilia, 0.5 to 0.99 G/L (n = 293; 64.7%). Most patients presented with chronic (64.6%), generalized skin lesions (75.9%), and pruritus (88.1%). Statistical analyses revealed 3 distinct patterns: (1) mild eosinophilia associated with localized skin disease, age less than 50 years, history of atopy, and diagnosis of eczema or infectious disease; (2) moderate eosinophilia linked to generalized skin lesions, pruritus, age more than 70 years, and autoimmune bullous disease; and (3) severe eosinophilia associated with diagnosis of hypereosinophilic syndromes, drug hypersensitivity, or malignant disease. CONCLUSIONS: Based on the pattern analysis of patients with dermatoses associated with blood eosinophilia, a diagnostic workup has been developed aiming at setting the correct differential diagnosis in a feasible and effective manner.

Infliximab reduces activated myeloid dendritic cells, different macrophage subsets and CXCR3-positive cells in granuloma annulare.

Disseminated granuloma annulare (GA) is a rare granulomatous dermatitis of unknown etiology. Treatment is often challenging and lack of a uniformly effective treatment, adds to the disease morbidity. Tumor necrosis factor (TNF)-α is an important cytokine in granuloma formation and previous reports have shown improvement of disseminated GA with anti-TNF-α therapy. Nevertheless, the underlying mechanism of actions of TNF-α inhibitors in GA remains unclear. Our aim was to evaluate alterations in the inflammatory infiltrate in a patient who experienced complete clearance of GA after treatment with infliximab. A skin biopsy was obtained before and 24 weeks after treatment with infliximab 5 mg/kg at weeks 0, 2, 6, 14 and 24. Immunohistochemical stains were performed in pre- and post-treatment biopsy specimens using CD1a, CD4, CD8, CD11c, CD32, CD68, CD69, CD163, CD183 and human leukocyte antigen (HLA)-DR to characterize alterations of the infiltrates. Parallel with clinical improvement, we observed a marked decrease in myeloid (CD11c) dendritic cells, different macrophage subsets (CD68, CD32, CD163) and T cells. In addition, a marked reduction of activation markers (HLA-DR, CD69) and CD183+ (CXCR3) cells was observed in post-treatment biopsy specimens. In conclusion, the clinical improvement of disseminated GA by infliximab is paralleled by inhibition of activated myeloid dendritic cells, different macrophage subsets and type 1 T cells.

Langerhans Cells Facilitate UVB-Induced Epidermal Carcinogenesis.

UVB light is considered the major environmental inducer of human keratinocyte (KC) DNA mutations, including within the tumor-suppressor gene p53, and chronic exposure is associated with cutaneous squamous cell carcinoma formation. Langerhans cells (LCs) comprise a dendritic network within the suprabasilar epidermis, yet the role of LCs in UVB-induced carcinogenesis is largely unknown. Herein we show that LC-intact epidermis develops UVB-induced tumors more readily than LC-deficient epidermis. Although levels of epidermal cyclopyrimidine dimers following acute UVB exposure are equivalent in the presence or absence of LCs, chronic UVB-induced p53 mutant clonal islands expand more readily in association with LCs, which remain largely intact and are preferentially found in proximity to the expanding mutant KC populations. The observed LC facilitation of mutant p53 clonal expansion is completely αß and γδ T-cell independent and is associated with increased intraepidermal expression of IL-22 and the presence of group 3 innate lymphoid cells. These data demonstrate that LCs have a key role in UVB-induced cutaneous carcinogenesis and suggest that LCs locally stimulate KC proliferation and innate immune cells that provoke tumor outgrowth.

Mechanisms of chemical cooperative carcinogenesis by epidermal Langerhans cells.

Cutaneous squamous cell carcinoma (SCC) is the most prevalent invasive malignancy with metastatic potential. The epidermis is exposed to a variety of environmental DNA-damaging chemicals, principal among which are polyaromatic hydrocarbons (PAHs) ubiquitous in the environment, tobacco smoke, and broiled meats. Langerhans cells (LCs) comprise a network of dendritic cells situated adjacent to basal, suprabasal, and follicular infundibular keratinocytes that when mutated can give rise to SCC, and LC-intact mice are markedly more susceptible than LC-deficient mice to chemical carcinogenesis provoked by initiation with the model PAH, 7,12-dimethylbenz[a]anthracene (DMBA). LCs rapidly internalize and accumulate DMBA as numerous membrane-independent cytoplasmic foci. Repopulation of LC-deficient mice using fetal liver LC-precursors restores DMBA-induced tumor susceptibility. LC expression of p450 enzyme CYP1B1 is required for maximal rapid induction of DNA-damage within adjacent keratinocytes and their efficient neoplastic transformation; however, effects of tumor progression also attributable to the presence of LC were revealed as CYP1B1 independent. Thus, LCs make multifaceted contributions to cutaneous carcinogenesis, including via the handling and metabolism of chemical mutagens. Such findings suggest a cooperative carcinogenesis role for myeloid-derived cells resident within cancer susceptible epithelial tissues principally by influencing early events in malignant transformation.