SpatialView: an interactive web application for visualization of multiple samples in spatial transcriptomics experiments.

MOTIVATION: Spatial transcriptomics (ST) experiments provide spatially localized measurements of genome-wide gene expression allowing for an unprecedented opportunity to investigate cellular heterogeneity and organization within a tissue. Statistical and computational frameworks exist that implement robust methods for pre-processing and analyzing data in ST experiments. However, the lack of an interactive suite of tools for visualizing ST data and results currently limits the full potential of ST experiments. RESULTS: To fill the gap, we developed SpatialView, an open-source web browser-based interactive application for visualizing data and results from multiple 10× Genomics Visium ST experiments. We anticipate SpatialView will be useful to a broad array of clinical and basic science investigators utilizing ST to study disease. AVAILABILITY AND IMPLEMENTATION: SpatialView is available at https://github.com/kendziorski-lab/SpatialView (and https://doi.org/10.5281/zenodo.10223907); a demo application is available at https://www.biostat.wisc.edu/˜kendzior/spatialviewdemo/.

Cutaneous granulomas associated with rubella virus: A clinical review.

Since the initial identification of vaccine-derived rubella virus (RuV) in the cutaneous granulomas of pediatric patients with inborn errors of immunity in 2014, more than 80 cases of RuV granulomas have been reported implicating both vaccine-derived and wild type RuV. Previously thought to arise exclusively in patients with significant immunocompromise, the identification of RuV granulomas in clinically immunocompetent patients adds nuance to our understanding of the interplay between host environment, immune dysregulation, and RuV granuloma formation. This review summarizes the literature on RuV granulomas including clinical and histopathologic features, proposed pathomechanisms supporting granuloma development, and potential therapeutic options. There is no standardized algorithm to guide the workup and diagnosis of suspected RuV granulomas. We highlight the importance of contributing RuV granuloma cases to ongoing Centers for Disease Control and Prevention surveillance efforts to monitor wild type and vaccine-derived RuV transmission. Studies advancing our understanding of RuV granulomas may provide insights into the role of viral infectious agents in granulomatous disease pathogenesis and guide the development of improved therapeutic options.

Pediatric cutaneous Crohn disease: A case series of 89 patients and review.

BACKGROUND: Cutaneous (or "Metastatic") Crohn disease (CCD) is a rare and underrecognized disease characterized by cutaneous granulomatous inflammation. We describe patient demographics, clinical characteristics, histology, and treatment of 89 pediatric cases of CCD, including 78 previously reported and 11 new cases seen at four academic institutions. We emphasize the efficacy of biologic mono- and dual therapy. METHODS: PubMed identified cases using keywords including "metastatic Crohn disease" and "cutaneous Crohn disease". Patients were identified by retrospective review of the electronic health record including histopathologic diagnosis consistent with CCD. Chart review collected demographic, clinical, and histologic data. RESULTS: Most pediatric patients with CCD are male 55% (49/89), present with edema (73/89, 82%) and erythema (47/89, 53%) of the genitals (33/49, 67%), and have intestinal Crohn disease (69/89, 78%). Oral corticosteroids (53/75, 71%) and metronidazole (29/75, 39%) are the most frequently prescribed medications. Of the 17 patients treated with tumor necrosis factor (TNF)-blockade, 94% (16/17) had partial or total clearance. Ustekinumab resulted in clearance of cutaneous disease in two patients (2/3, 67%) and partial clearance in one patient (1/3, 33%). Two cases achieved total clearance with the use of dual biologic therapy defined as the use of two biologic therapies with differing mechanisms of action or the use of a biologic therapy and small molecule inhibitor. CONCLUSIONS: TNF blockade is an effective treatment for pediatric CCD, and interleukin-12/23 inhibitors may be similarly effective. Consideration of dual biologic therapy may be useful in pediatric patients requiring discordant therapies for their intestinal and cutaneous CD.

COVID-19 associated severe mucocutaneous blistering eruptions: A case series.

Mucocutaneous eruptions are associated with numerous infectious processes and can present as erythema multiforme (EM), reactive infectious mucocutaneous eruption (RIME), Stevens Johnson syndrome (SJS), or toxic epidermal necrolysis (TEN). Limited reports have detailed the association of these eruptions with SARS-CoV-2 infection. We present a series of eight cases of severe mucocutaneous blistering eruptions associated with SARS-CoV-2 infection. A retrospective case series was performed at six tertiary medical centers from March 1, 2020 to August 1, 2022. Inclusion criteria were met with a clinical diagnosis of EM, RIME, SJS, or TEN and a positive SARS-CoV-2 test (rapid antigen or polymerase chain reaction) less than 4 weeks prior to onset of dermatologic manifestation. Data was collected at time of each patient encounter. Eight patients met criteria with six pediatric patients (<18 years of age) having a median age of 15 years and two adult patients (>18 years of age) having a median age of 36 years. Patients were found to have a clinical diagnosis of RIME in 85.7% of cases. Oral mucosal involvement was the most common clinical finding (100%), followed by ocular (50.0%), urogenital (50.0%), and skin (37.5%) involvement. Evaluation did not reveal any additional infectious triggers in four patients. Evidence of possible concurrent or previous infectious triggers were identified in four patients. This case series highlights the development of severe mucocutaneous eruptions in association with COVID-19 infection, as well as the potential contributing role of concurrent or prior infections.

Healthcare educational debt in the united states: unequal economic impact within interprofessional team members.

BACKGROUND: Advancing healthcare access and quality for underserved populations requires a diverse, culturally competent interprofessional workforce. However, high educational debt may influence career choice of healthcare professionals. In the United States, health professions lack insight into the maximum educational debt that can be supported by current entry-level salaries. The purpose of this interprofessional economic analysis was to examine whether average educational debt for US healthcare graduates is supportable by entry-level salaries. Additionally, the study explored whether trainees from minoritized backgrounds graduate with more educational debt than their peers in physical therapy. METHODS: The study modeled maximum educational debt service ratios for 12 healthcare professions and 6 physician specialties, incorporating profession-specific estimates of entry-level salary, salary growth, national average debt, and 4 loan repayment scenarios offered by the US Department of Education Office of Student Financial Aid. Net present value (NPV) provided an estimate for lifetime "economic power" for the modeled careers. The study used a unique data source available from a single profession (physical therapy, N = 4,954) to examine whether educational debt thresholds based on the repayment model varied between minoritized groups and non-minoritized peers. RESULTS: High salary physician specialties (e.g. obstetrics/gynecology, surgery) and professions without graduate debt (e.g. registered nurse) met debt ratio targets under any repayment plan. Professions with strong salary growth and moderate debt (e.g. physician assistant) required extended repayment plans but had high career NPV. Careers with low salary growth and high debt relative to salary (e.g. physical therapy) had career NPV at the lowest range of modeled professions. 29% of physical therapy students graduated with more debt than could be supported by entry-level salaries. Physical therapy students from minoritized groups graduated with 10-30% more debt than their non-minoritized peers. CONCLUSIONS: Graduates from most healthcare professions required extended repayment plans (higher interest) to meet debt ratio benchmarks. For several healthcare professions, low debt relative to salary protected career NPV. Students from minoritized groups incurred higher debt than their peers in physical therapy.

Angiokeratoma-like purpuric palmar nodules following chemotherapy.

We describe a patient with leukemia undergoing chemotherapy who developed painful purpuric nodules of the digits. These findings were concerning for endocarditis (clinically) and angiokeratomas on gross histology. After extensive evaluation, we report the development of painful purpuric nodules as a likely side effect of the patient's therapeutic regimen (hydroxyurea, danorubicin, cytarabine, and methotrexate).

Occipital alopecia in a young man.

Lipedematous alopecia is a rare, non-androgenic form of alopecia that is challenging to diagnose, often requiring clinical-pathological correlation. The condition has been reported predominantly in African-American females, but more recently has been described in a broader demographic [1,2]. We describe a rare case of a young Caucasian man with isolated lipedematous alopecia who presented with a boggy, erythematous plaque with alopecia of the occipital scalp and subcutaneous thickening with lymphocytic dermal infiltrate and decreased anagen hairs on histology.

Intralesional corticosteroid-induced hypopigmentation and atrophy.

Intralesional corticosteroids are associated with various, uncommon, local adverse events [1]. Atrophy and hypopigmentation most commonlyremain localized to sites of injection. However, outward radiation in a linear, streaky pattern has been reported and is termed "perilesional/perilymphatic hypopigmentation or atrophy [2]." We report a case of this rare adverse event.

Angioinvasive fungal infections impacting the skin: Diagnosis, management, and complications.

As discussed in the first article in this continuing medical education series, angioinvasive fungal infections pose a significant risk to immunocompromised and immunocompetent patients alike, with a potential for severe morbidity and high mortality. The first article in this series focused on the epidemiology and clinical presentation of these infections; this article discusses the diagnosis, management, and potential complications of these infections. The mainstay diagnostic tests (positive tissue culture with histologic confirmation) are often supplemented with serum biomarker assays and molecular testing (eg, quantitative polymerase chain reaction analysis and matrix-assisted laser desorption ionization time-of-flight mass spectrometry) to ensure proper speciation. When an angioinvasive fungal infection is suspected or diagnosed, further workup for visceral involvement also is essential and may partially depend on the organism. Different fungal organisms have varied susceptibilities to antifungal agents, and knowledge on optimal treatment regimens is important to avoid the potential complications associated with undertreated or untreated fungal infections.

Angioinvasive fungal infections impacting the skin: Background, epidemiology, and clinical presentation.

Angioinvasive fungal infections cause significant morbidity and mortality because of their propensity to invade blood vessel walls, resulting in catastrophic tissue ischemia, infarct, and necrosis. While occasionally seen in immunocompetent hosts, opportunistic fungi are emerging in immunosuppressed hosts, including patients with hematologic malignancy, AIDS, organ transplant, and poorly controlled diabetes mellitus. The widespread use of antifungal prophylaxis has led to an "arms race" of emerging fungal resistance patterns. As the at-risk population expands and new antifungal resistance patterns develop, it is critical for dermatologists to understand and recognize angioinvasive fungal pathogens, because they are often the first to encounter the cutaneous manifestations of these diseases. Rapid clinical recognition, histopathologic, and culture confirmation can help render a timely, accurate diagnosis to ensure immediate medical and surgical intervention. Superficial dermatophyte infections and deep fungal infections, such as blastomycosis and histoplasmosis, have been well characterized within the dermatologic literature, and therefore this article will focus on the severe infections acquired by angioinvasive fungal species, including an update on new and emerging pathogens. In the first article in this continuing medical education series, we review the epidemiology and cutaneous manifestations. The second article in the series focuses on diagnosis, treatment, and complications of these infections.

Increasing Access to High Value Care: Preventing Complications in Common Disorders.

Most infantile hemangiomas (IHs), the most common vascular tumors of childhood, evolve without complications; however 10% to 12% require specialty referral for treatment. To emphasize the complications of late referral, we present a case of necrotizing infection within a segmental IH leading to sepsis. Early evaluation by a pediatric dermatologist could have prevented this life-threatening and disfiguring complication. We discuss how teledermatology would enable rapid triage of such critical cases in underserved areas, increasing access to high-value care and optimizing outcomes for our most vulnerable patients.

Micronutrient Deficiencies in Patients With Inflammatory Bowel Disease.

Inflammatory bowel disease (IBD) can cause micronutrient deficiencies that have cutaneous manifestations. Dermatologists may be the first to identify an undiagnosed micronutrient deficiency in the affected population. The approach to monitoring and repleting a micronutrient deficiency may be impacted by factors such as IBD activity and potential interactions between supplements and medications used to treat IBD. In this article, we review the most common micronutrient deficiencies observed in patients with IBD and their associated cutaneous manifestations. We also provide guidance for monitoring and supplementing each micronutrient discussed.

Culprits of Medication-Induced Telogen Effluvium, Part 2.

Telogen effluvium (TE) is a common mechanism underlying medication-related alopecia. The inciting cause of TE may be difficult to identify due to delays in clinically apparent hair loss. Because medication-induced TE is a nonscarring alopecia that typically is reversible, appropriate management requires identification of the underlying trigger and cessation of potential culprit medications. In part 2 of this 2-part series on medication-induced TE, we focus on anticoagulant and antihypertensive medications.

Granuloma Annulare Exhibits Mixed Immune and Macrophage Polarization Profiles with Spatial Transcriptomics.

Granuloma annulare (GA) is an idiopathic condition characterized by granulomatous inflammation in the skin. Prior studies have suggested that GA develops from various triggers, leading to a complex interplay involving innate and adaptive immunity, tissue remodeling, and fibrosis. Macrophages are the major immune cells comprising GA granulomas; however, the molecular drivers and inflammatory signaling cascade behind macrophage activation are poorly understood. Histologically, GA exhibits both palisaded and interstitial patterns on histology; however, the molecular composition of GA at the spatial level remains unexplored. GA is a condition without Food and Drug Administration-approved therapies despite the significant impact of GA on QOL. Spatial transcriptomics is a valuable tool for profiling localized, genome-wide gene expression changes across tissues, with emerging applications in clinical medicine. To improve our understanding of the spatially localized gene expression patterns underlying GA, we profiled the spatial gene expression landscape from 6 patients with GA. Our findings revealed mixed T helper 1 and T helper 2 signals comprising the GA microenvironment and spatially distinct M1 and M2 macrophage polarization characteristics. IFN-γ and TNF signals emerged as important regulators of GA granulomatous inflammation, and IL-32 emerged as a key driver of granulomatous inflammation. Overall, our spatial transcriptomics data indicate that GA exhibits mixed immune and macrophage polarization.

Perioperative management and clinical outcomes of peristomal pyoderma gangrenosum.

Peristomal pyoderma gangrenosum is an uncommon subtype of pyoderma gangrenosum mainly affecting stoma sites of patients with inflammatory bowel disease. While surgical treatments are often used to assist healing, little is known about the relationship between surgical interventions and the rate of recurrence of peristomal pyoderma gangrenosum. The aim of this study was to identify patient and clinical factors associated with peristomal pyoderma gangrenosum recurrence following surgical intervention. A multi-institutional retrospective case series and literature review was conducted to evaluate patient characteristics and perioperative treatment. Patients of any age with peristomal pyoderma gangrenosum undergoing surgical operations related to their pyoderma gangrenosum or due to another comorbidity were included. Descriptive statistics were used to characterize demographic information. Associations were evaluated using Wilcoxon's rank-sum test for continuous variables and Fisher's exact test for categorical data. Thirty-seven cases were included, 78.3% of which had a history of inflammatory bowel disease. Overall, 13 (35.1%) cases experienced recurrence at 30 days. There was no significant association identified between patient demographics, stoma location, surgical intervention, or perioperative treatment with rate of recurrence at 30 days post-operation. While no clinical risk factors or treatments were associated with recurrence, our work underscores the importance of a multidisciplinary approach to this disease to address gastrointestinal, dermatologic, and surgical components of treatment.

The Role of Dietary Antioxidants in Melanoma and Nonmelanoma Skin Cancer.

Dietary supplements, including vitamins and their derivatives, have been utilized within the field of dermatology to treat a variety of skin conditions. Antioxidants inhibit oxidation and decrease cellular damage caused by free radicals, potentially preventing DNA damage due to UV radiation. Laboratory studies have demonstrated promising results supporting the possible role of antioxidants for prevention of skin cancer related to UV exposure. We review the effects of frequently encountered antioxidants and vitamins suggested for the chemoprevention of melanoma and nonmelanoma skin cancer (NMSC) in humans.