Cutaneous Infiltrates Research Articles

A Novel Case of Reactive Perforating Collagenosis (RPC) with Cutaneous Infiltration of EBV+ Angioimmunoblastic T-cell Lymphoma (AITL).

A Novel Case of Reactive Perforating Collagenosis (RPC) with Cutaneous Infiltration of EBV+ Angioimmunoblastic T-cell Lymphoma (AITL).

Site-discordant expression of myeloid cell nuclear differentiation antigen in blastic plasmacytoid dendritic cell neoplasm

Abstract Objectives Blastic plasmacytoid dendritic cell neoplasm (BPDCN) is a rare and aggressive hematologic neoplasm that can show clinical, morphologic, and immunophenotypic overlap with acute myeloid leukemia. Myeloid cell nuclear differentiation antigen (MNDA) is a nuclear protein expressed by myelomonocytic cells previously reported to be reliably absent in BPDCN and proposed as a useful adjunct for the distinction of BPDCN and acute myeloid leukemia. We encountered a case of BPDCN that showed strong nuclear expression of MNDA in bone marrow and breast samples and weak to absent expression in skin samples, prompting us to reevaluate the expression of MNDA in BPDCN. Methods We collected all available BPDCN cases from the Stanford University archives collected in the past 10 years and subjected them to MNDA immunohistochemistry. In select cases, molecular profiling by next-generation sequencing was performed. Results We found 4 cases (of 8 total examined [50%]) with convincing site-discordant MNDA expression. This expression was seen in 3 of 6 (50%) bone marrow samples, 1 of 2 (50%) breast soft tissue samples, and 3 of 14 (up to 21%) skin samples and was not obviously predicted by age, sex, history of myeloid neoplasm, or treatment history. In 2 cases, MNDA was strongly expressed in 2 distinct sites (breast/bone marrow, skin/bone marrow) and negative in subsequent samples. Conclusions Our findings suggest that MNDA expression in BPDCN is anatomic site dependent and transient, with noncutaneous infiltrates showing more frequent expression than cutaneous infiltrates. These results caution against the use of MNDA to exclude BPDCN when considering the differential diagnosis of a blastic extramedullary infiltrate.

Solitary erythematous nodule on the breast

Teaser Text In this clinicopathological case, we describe the case of a woman in her 60s with a past medical history of plasma cell myeloma, commonly known as multiple myeloma, who presented to dermatology with a solitary erythematous nodule on her right breast, which was biopsied. We include clinical, dermoscopic and histopathological images of the patient’s striking lesion, and a discussion of the differential of this skin lesion.

Assessing T-cell receptor clonality by next-generation sequencing in atypical cutaneous lymphoid infiltrates and cutaneous T-cell lymphoma: A scoping review.

The diagnosis of cutaneous T-cell lymphoma (CTCL) remains challenging. Demonstration of a clonal T-cell population using T-cell receptor (TCR) gene rearrangement studies by next-generation sequencing (NGS) has been explored in several studies. This review summarizes the current literature on NGS-based sequencing methods for the assessment of TCR clonality in the evaluation of atypical cutaneous lymphoid infiltrates and CTCL on behalf of the American Society of Dermatopathology Appropriate Use Criteria Committee (lymphoproliferative subgroup). PubMed was searched for relevant articles, including CTCL and NGS, for clonality from 1967 to 2022. Thirteen studies were included in the analysis. The skin was the most commonly assayed compartment with TCR NGS. Sensitivity for TCR NGS in the skin ranged between 69% and 100%, compared to 44%-72% for polymerase chain reaction (PCR)-capillary electrophoresis. Specificity for TCR NGS in the skin ranged from 86% to 100%, compared to 77%-88% for PCR capillary electrophoresis. TCR NGS was also reported to have potential prognostic value in CTCL and can also be used to detect relapse and/or minimal residual disease after treatment.

Lateral Femoral Cutaneous Nerve Block or Wound Infiltration Combined with Pericapsular Nerve Group (PENG) Block for Postoperative Analgesia following Total Hip Arthroplasty through Posterior Approach: A Randomized Controlled Trial.

Background: Pericapsular nerve group (PENG) block, although effective for pain management following total hip arthroplasty (THA), does not cover skin analgesia. In this randomized controlled trial, we compared the effectiveness of PENG block combined with lateral femoral cutaneous nerve (LFCN) block or wound infiltration (WI) on postoperative analgesia and functional outcomes. Methods: Fifty patients undergoing posterior-approached THA under spinal anesthesia were randomly allocated to receive LFCN block with 10 mL of 0.5% ropivacaine or WI with 20 mL of 0.5% ropivacaine. In both groups, PENG block was performed by injecting 20 mL of 0.5% ropivacaine. Primary outcomes were static and dynamic pain scores (0-10 numeric rating scale) measured in the first 24 h after surgery. Secondary outcomes included postoperative opioid consumption, functional assessment and length of hospital stay. Results: Postoperative static NRS of patients receiving LFCN was higher than that of patients receiving WI at 6 h but lower at 24 h, with a median (IQR) of 3 (2-4) vs. 2 (1-2) (p < 0.001) and 2 (2-3) vs. 3 (3-4) (p = 0.02), respectively. Static pain scores at 12 h did not show significant differences, with an NRS of 3 (2-4) for WI vs. 3 (3-4) for LFCN (p = 0.94). Dynamic pain and range of movement followed a similar trend. No significant differences were detected in other outcomes. Conclusions: LFCN block was not inferior to WI for postoperative analgesia and functional recovery in association with PENG block during the first postoperative day, although it had worse short-term pain scores. Based on these results, it is reasonable to consider LFCN block as a valid alternative to WI or even a complementary technique added to WI to enhance skin analgesia during the first 24 h after THA. Future studies are expected to confirm this hypothesis and find the best combination between PENG block and other techniques to enhance analgesia after THA.

CCR10 Deficiency Reduces Blood Pressure Elevations, End-Organ Damage, and Cutaneous Infiltration of Regulatory T Cells in a Murine Model of Hypertension

Emerging evidence suggests a key role for inflammation and immune cell activation in the pathogenesis of hypertension and its associated end-organ damage. Regulatory T cells (Tregs) function primarily to limit inflammation and are generally considered protective in hypertension. However, Treg subsets can also have tissue-specific functions and play pathogenic roles in some inflammatory diseases through mechanisms, such as limiting angiogenesis. As such, the role of Tregs and its subsets in hypertension remain unclear. Recently, we demonstrated that CCR10+ Tregs are selectively decreased in the circulation of hypertensive patients. CCR10 is a key chemokine receptor for recruitment of immune cells to the skin. Although the skin has not been well studied in hypertension, prior reports in humans demonstrate that loss of skin microvessels (microvascular rarefaction) is a putative mechanism for blood pressure (BP) elevations in hypertension. Recent evidence also suggests that Tregs can promote apoptosis of vascular smooth muscle cells and endothelial cells (ECs). Thus, we hypothesized that CCR10+ Tregs promote hypertension through skin infiltration leading to enhanced microvascular rarefaction. Herein, we demonstrate that, compared to normotensive littermates, male mice with angiotensin II (Ang II)-induced hypertension have selectively increased abundance of CCR10+ Tregs in the skin (p=0.0004) with a corresponding decrease in the circulation (p=0.003). These mice also displayed increased cutaneous levels of the CCR10 ligand CCL27 (p=0.0007), suggesting a mechanism for increased CCR10+ Treg infiltration. To test a causal role of CCR10 in hypertension, we infused Ang II in control CCR10+/+ or CCR10-deficient (CCR10−/−) mice for 4 weeks. Our results demonstrate that CCR10−/− mice exhibit significant reductions in systolic blood pressure (p=0.004), albuminuria (p=0.01), and cardiac fibrosis (p=0.04) compared to wild type mice after Ang II infusion. In addition, CCR10−/− mice had a selective decrease in Tregs in the skin (p=0.02) without change in abundance of conventional CD4+ or CD8+ T cells after Ang II. CCR10−/− mice also exhibited greater cutaneous arteriolar density (p=0.02) after Ang II, consistent with reduced skin microvascular rarefaction. Finally, using PrediXcan, we demonstrate that higher genetically predicted levels of CCR10 are associated with increased risk of hypertension in humans. Taken together, our data suggest that CCR10 promotes Ang II-induced BP elevations and associated end-organ injury, at least in part by promoting Treg recruitment to the skin leading to microvascular rarefaction. K08HL153786, 5T32HL144446-05. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Dermatologic manifestations of hematologic disorders.

Distinguishing key morphologic features and understanding the pathophysiology of common cutaneous manifestations of hematologic disorders is essential to ensure prompt and appropriate treatment. In fact, classic cutaneous signs may provide the first clue to the diagnosis of an underlying hematologic disease. Disorders of coagulation, vascular abnormalities, or cutaneous infiltration and deposition are responsible for the underlying pathophysiology of cutaneous manifestations in the majority of cases. Hematologists often feel ill-equipped in identifying morphologic changes in the skin. Thus, the purpose of this review is to provide a comprehensive overview of classic cutaneous manifestations and diagnostic considerations of the associated hematologic conditions. Though there is a specific focus on non-malignant disorders, those straddling the spectrum of malignancy are also discussed. In many disease states, the skin may serve as an important marker of an emerging hematologic disorder, so close collaboration and multidisciplinary input remain essential to provide optimal and timely care for these patients.

Rare cutaneous manifestation of B‐cell chronic lymphocytic leukaemia involving the toes

AbstractB cell chronic lymphocytic leukaemia (B‐CLL) presenting with cutaneous infiltration is rare, and when it occurs, it presents most commonly on the head and neck. We present the case of an 80‐year‐old woman with a 2‐month history of erythema, swelling and pain affecting all her toes. She had a history of B‐CLL diagnosed 20 years previously that had remained stable under observation without treatment. A toe skin biopsy showed a diffuse infiltrate of lymphoid cells occupying the dermis composed of small mature lymphoid cells with a monotonous appearance. On immunohistochemistry, the neoplastic lymphoid cells stained positive for the B‐cell marker CD20. Overall, the morphology and immunophenotype were consistent with cutaneous involvement by chronic lymphocytic leukaemia/small lymphocytic lymphoma (CLL/SLL). We concluded that her symptoms were directly caused by skin infiltration of B‐CLL.

Asymptomatic skin lesions as a diagnostic clue in multiple myeloma – A case report

Multiple myeloma (MM) is a rare cancer of plasma cells in the bone marrow. Cutaneous plasmacytoma is an uncommon but specific skin lesion in MM with an incidence of 2%. Cutaneous plasma cell infiltration in pre-existing MM is a very rare phenomenon, with approximately 100 cases described in the literature. Here, we report a case of a 61-year-old male who presented with asymptomatic skin nodules and plaques over the chest, abdomen, and back of the trunk for five months. Histopathological examination showed mononuclear cells with moderate cytoplasm and round to ovoid nuclei. Immunohistochemistry showed CD138 and kappa positivity and lambda and CD20 negativity, confirming the diagnosis of cutaneous plasmacytoma. Bone marrow biopsy and immunohistochemistry revealed bone marrow plasmacytosis with kappa light chain restriction. Serum free light chain ratio was 106.61 and fluorescence in situ hybridization showed del 13q. The clinical features and investigations fulfilled the diagnostic criteria for MM, and the patient was started on chemotherapy, following which the skin lesions improved. Development of skin lesions is seen in the advanced stages of MM and is considered a bad prognostic sign. However, they can also be seen as initial manifestations of the disease, as in this case. Hence, meticulous investigations and early diagnosis are of paramount importance.

Predicting severe pain after cesarean section: prospective cohort study

BACKGROUND: Severe and unbearable pain after abdominal delivery is recorded in 20% of cases, indicating the limitations of the applied methods of postoperative pain relief and the need for a personalized approach. Tests assessing preoperative pain threshold and anxiety have the greatest sensitivity and specificity as predictors of intense postoperative pain. The informative value of these tests in the Russian obstetric population has not been assessed. OBJECTIVE: This study aimed to determine the optimal method for predicting severe pain after cesarean section (CS). MATERIALS AND METHODS: This prospective cohort study included 212 women who underwent elective CS under spinal anesthesia. The Hospital Anxiety and Depression Scale (HADS) anxiety rating scale, pressure algometry, and cutaneous infiltration anesthesia pain intensity assessment were used as predictors of high-intensity pain. Postoperative pain intensity was assessed using a 10-point Numeric Rating Scale (NRS). The maximum level of pain according to the central pain level at rest (NRSr) and during movement (NRSa) was recorded 24 hour postoperatively. The number of requests for “rescue analgesia” was recorded. The predictive value of the studied methods was determined based on ROC curve analysis. RESULTS: Median (interquartile range) NRSa was 5 [4–5]. Severe pain was recorded in 14% of the patients. The area under the ROC-curve (AUC), reflecting the relationship between severe postoperative pain and pressure-pain threshold, was 0.91±0.03 with 95% confidence interval (CI) of 0.84–0.97 (p 0.001). The relationship between pain intensity during infiltration anesthesia and postoperative pain severity had AUC=0.88 ± 0.04 with 95% CI of 0.81–0.96 (p 0.001). The HADS anxiety score demonstrated the lowest predictive ability (AUC=0.69±0.06; 95% CI, 0.81–0.96; p 0.001). When all three techniques were used together, the AUC was 0.924±0.024 with 95% CI 0.88–0.97 (p=0.001). CONCLUSION: Preoperative pressure-pain threshold and pain severity during infiltration anesthesia are reliable predictors of severe pain after CS. Assessment of preoperative anxiety using HADS has low sensitivity and specificity. However, its use in conjunction with methods for assessing the pain threshold increases the predictive value of the combined model compared with the results of using the methods separately.

Spatial Mass Cytometry–Based Single-Cell Imaging Reveals a Disrupted Epithelial–Immune Axis in Prurigo Nodularis

Prurigo nodularis (PN) is a chronic, inflammatory skin condition that disproportionately affects African Americans and features intensely pruritic, hyperkeratotic nodules on the extremities and trunk. PN is understudied compared with other inflammatory skin diseases, with the spatial organization of the cutaneous infiltrate in PN yet to be characterized. In this work, we employ spatial imaging mass cytometry to visualize PN lesional skin inflammation and architecture with single-cell resolution through an unbiased machine learning approach. PN lesional skin has increased expression of caspase 3, NF-kB, and phosphorylated signal transducer and activator of transcription 3 compared with healthy skin. Keratinocytes in lesional skin are subdivided into CD14+CD33+, CD11c+, CD63+, and caspase 3-positive innate subpopulations. CD14+ macrophage populations expressing phosphorylated extracellular signal-regulated kinase 1/2 correlate positively with patient-reported itch (P= .006). Hierarchical clustering reveals a cluster of patients with PN with greater atopy, increased NF-kB+ signal transducer and activator of transcription 3-positive phosphorylated extracellular signal-regulated kinase 1/2-positive monocyte-derived myeloid dendritic cells, and increased vimentin expression (P < .05). Neighborhood analysis finds interactions between CD14+ macrophages, CD3+ T cells, monocyte-derived myeloid dendritic cells, and keratinocytes expressing innate immune markers. These findings highlight phosphorylated extracellular signal-regulated kinase-positive CD14+ macrophages as contributors to itch and suggest an epithelial-immune axis in PN pathogenesis.

Spontaneous Lesions of Endangered Geriatric Julia Creek Dunnarts (Sminthopsis douglasi, Archer 1979) with Emphasis in Reproductive Pathology.

Julia Creek dunnarts are an endangered species of carnivorous marsupials and the focus of multiple conservation strategies involving significant resources such as captive breeding programs. Despite the relevance for conservation, no study to date has focused on evaluating geriatric diseases in dunnarts. This study describes the pathology findings in a group of one wild and thirty-five captive-born, mostly geriatric Julia Creek dunnarts that failed to produce offspring over multiple breeding periods. A total of 20 females and 16 males were submitted for a postmortem examination, with ages ranging from 9 to 42 and 12 to 42 months for females and males, respectively. Of these, 10 had unremarkable findings. The most common condition in females was cystic glandular hyperplasia (n = 8), typical of hormonal dysregulation profiles in senescence, particularly hyperestrogenism. Rarely, cutaneous disease represented by unidentified dermal round cell infiltrates was observed in females (n = 2). Primary reproductive hormonal dysregulation was also suspected in males diagnosed with testicular degeneration, aspermatogenesis and/or atrophy (n = 3). Cutaneous round cell infiltrates, possibly compatible with epitheliotropic lymphomas, were seen in males (n = 3), and 2/3 affected males also had concurrent testicular degeneration or atrophy, indicating male sex could be a predictor for lymphoid neoplasia in aged dunnarts, especially in individuals with concurrent testosterone-luteinizing hormone dysregulation as it occurs in gonadectomized animals. The role of an underlying viral etiology is also explored. This study is the first to describe major spontaneous diseases in endangered aged Julia Creek dunnarts, providing an important understanding of senescence and geriatric diseases within a conservation context.

Primary Cutaneous CD4 Small/Medium T-Cell Lymphoproliferative Disorder Following COVID-19 Vaccination-What Do We Know about Lymphoproliferative Disorders and Cutaneous Lymphomas after COVID-19 Vaccination? A Report of an Atypical Case and a Review of the Literature.

The association between Primary cutaneous CD4 small/medium T-cell lymphoproliferative disorder (PCSM-TCLPD) and COVID-19 immunization has been sparsely documented in the medical literature. Reviewing the literature, albeit infrequently, we can find cases of the recurrence and new onset of lymphoproliferative processes and cutaneous lymphomas following the COVID-19 vaccine. Many of the entities we encounter are classified as cutaneous lymphoproliferative disorders. The prevailing hypothesis suggests that the predominant cutaneous reactions to SARS-CoV-2 vaccines may stem from T-cell-mediated immune activation responses to vaccine components, notably messenger RNA (mRNA). Specifically, it is posited that the presence of cutaneous lymphoid infiltrates may be linked to immune system stimulation, supported by the absence, to date, of instances of primary cutaneous B-cell lymphoma following mRNA vaccination. Within this context, it is imperative to underscore that the etiological association between PCSM-TCLPD and COVID-19 vaccination should not discourage vaccination efforts. Instead, it underscores the necessity for continuous surveillance, in-depth investigation, and comprehensive follow-up studies to delineate the specific attributes and underlying mechanisms of such cutaneous manifestations post vaccination.

Early‐onset idiopathic pyoderma gangrenosum

AbstractNeutrophilic dermatoses are autoinflammatory disorders characterised by sterile cutaneous inflammatory neutrophilic infiltrates. This group of diseases is rare in infants and children, where sepsis is the diagnosis of exclusion. This report focuses on the clinical presentation, investigation and management of infants with idiopathic pyoderma gangrenosum. It should allow for a better appreciation of the disease and a more patient‐focused approach to its diagnosis and management.

Forensic pilot application of rehydrating solutions on human cadaveric skin: what are the effects on hemorrhagic infiltrates?

The microscopic evaluation of hemorrhagic infiltrates is crucial in forensic diagnostics, but it proves challenging in corificated and mummified cadavers. In these cases, pre-treatment with rehydrating solutions is recommended, although their effects on the hemorrhagic infiltrate are not well understood. In this pilot study, we microscopically investigated the effect of two different rehydrating solutions-Sandison's solution and fabric softener-on well-preserved human cadaveric skin samples taken from areas affected by an ecchymotic lesion, comparing them with direct fixation in formalin. Specifically, we examined the topographic distribution of the hemorrhagic infiltrate in each layer of the skin by assigning a semi-quantitative score, conducted mutual comparisons, and performed statistical analysis. Histologically, compared to direct fixation in formalin, a slight and statistically non-significant reduction in the hemorrhagic infiltrate was observed in samples pre-treated with fabric softener. On the other hand, a more pronounced and statistically significant decrease in scores was observed in samples pre-treated with Sandison's solution. This effect is likely due to the fact that Sandison's solution, due to its components, exerts an osmotic effect, partially inducing osmotic lysis of red blood cells. Overall, extensive areas of hemorrhagic infiltrates were preserved, although to a lesser extent, while smaller foci were markedly reduced, sometimes even disappearing. The findings suggest that Sandison's solution has a detrimental effect on cutaneous hemorrhagic infiltrates, emphasizing the importance of being cautious and conducting dual sampling, using both formalin and a rehydrating solution, for forensic examination of mummified or corificated skin samples.

Epstein-Barr Virus-Associated Lymphomatoid Papules: A Sign of Immunosuppression Resembling Lymphomatoid Papulosis.

Epstein-Barr virus (EBV)-positive lymphoproliferative disorders associated with immunodeficiency constitute a spectrum of lymphoid and plasma cell proliferations that vary in cytomorphology, immunophenotype, and clinical behavior. CD30-positive cutaneous lymphocytic infiltrates with EBV expression and lymphomatoid papulosis-like presentations have been rarely reported. This retrospective study assessed the clinical and histopathological characteristics of EBV-positive cases with papulonodular morphologies and CD30 positivity seen by Northwestern Medicine Dermatopathology. Twelve patients (7M:5F, mean age 69 years) were presented with papular cutaneous lesions without antecedent patch/plaque disease. Nine cases were associated with known immunosuppression in the setting of transplant-related therapies (n = 4), hematopoietic malignancy (n = 2), post-transplant hematopoietic malignancy (n = 1), and autoimmune disease treatment (n = 2). Two patients had age-related immunosenescence. Four patients demonstrated EBV viremia; for 2 patients, this finding comprised the first sign of immunosuppression. Workup was negative for systemic lymphoma in all patients. Various treatment strategies were used, including observation (n = 3), discontinuation/reduction of immunosuppression (n = 3), rituximab (n = 4), and steroids (n = 4). At mean 30-month follow-up, 4 patients (33.3%) were alive, 3 with and 1 without disease. Eight patients (67.6%) had died, 3 after lesional resolution and 5 with recurrent disease. Biopsies revealed mixed lymphoid infiltrates composed of atypical CD30-positive T cells (n = 5) or B cells (n = 7) with variable EBV-encoded small RNA expression. These cases suggest clinicopathologic presentations resembling lymphomatoid papulosis with atypical, large CD30-positive, EBV-positive cells could comprise first sign of potentially serious immunodeficiency and should prompt evaluation for EBV viremia. These cases also broaden the current picture of immunodeficiency-associated lymphoproliferative disorders to include lymphomatoid papulosis-like clinical presentations.

Th17-associated cytokines IL-17 and IL-23 in inflamed skin of Darier disease patients as potential therapeutic targets

Darier disease (DD) is a rare, inherited multi-organ disorder associated with mutations in the ATP2A2 gene. DD patients often have skin involvement characterized by malodorous, inflamed skin and recurrent, severe infections. Therapeutic options are limited and inadequate for the long-term management of this chronic disease. The aim of this study was to characterize the cutaneous immune infiltrate in DD skin lesions in detail and to identify new therapeutic targets. Using gene and protein expression profiling assays including scRNA sequencing, we demonstrate enhanced expression of Th17-related genes and cytokines and increased numbers of Th17 cells in six DD patients. We provide evidence that targeting the IL-17/IL-23 axis in a case series of three DD patients with monoclonal antibodies is efficacious with significant clinical improvement. As DD is a chronic, relapsing disease, our findings might pave the way toward additional options for the long-term management of skin inflammation in patients with DD.

Leukemia Cutis-The Current View on Pathogenesis, Diagnosis, and Treatment.

Leukemia cutis (LC) is defined as the leukemic infiltration of the epidermis, the dermis, and the subcutaneous tissue. Leukemia cutis may follow or occur simultaneously with the diagnosis of systemic leukemia. However, cutaneous lesions are occasionally diagnosed as the primary manifestation of leukemia. Leukemic skin infiltrations demonstrate considerable variation regarding a number of changes, distribution, and morphology. The highest incidence of LC is observed in chronic lymphocytic leukemia, monocytic and myelomonocytic acute myeloid leukemia, and T-cell lineage leukemia. Although the pathogenic mechanism of the invasion of leukemic cells into the skin is not well understood, chemokine receptors and adhesion molecules as well as the genetic characteristics of leukemia are thought to play a role. Leukemic skin lesions may be localized or disseminated and may occur alone or in combination on any site of the skin, most frequently in the trunk and extremities. The most common clinical presentations of leukemia cutis are papules, nodules, macules, plaques, and ulcers. In most patients, the complete or partial resolution of cutaneous infiltrations occurs simultaneously with hematologic remission. However, in patients with resistant disease or recurrent skin infiltration, local radiotherapy can be used. This review presents recent data on the pathogenesis, diagnosis, and treatment of leukemic skin involvement in different types of leukemia.

Precursor B-sejtes lymphoblastos lymphoma cutan tünetei

The case of a 15-year-old boy diagnosed with cutaneous and subcutaneous infiltration of precursor B-cell lymphoblastic lymphoma is presented. The patient’s first skin symptoms appeared 4 months prior to the first hospitalization. According to the parents, it was diagnosed as lipoma by his family doctor and his dermatologist. The differential diagnosis of the case and the clinical features of the pediatric dermatological conditions presenting in nodular form are briefly reviewed.

Cutaneous basophil infiltration in atopic dermatitis is associated with abundant epidermal infiltration of helper T cells: A preliminary retrospective study.

Atopic dermatitis (AD) is a heterogenous inflammatory skin disorder. Our previous study revealed that basophil infiltration in skin is observed in approximately 60% of AD cases. However, the clinical and histological characteristics of AD associated with basophil infiltration remain unclear. We examined basophil infiltration by immunohistochemical staining of 38 specimens from 34 patients who underwent skin biopsies to diagnose AD from April 2016 to September 2021 at Tokyo Medical and Dental University Hospital. The patients/specimens were divided into two groups, 17 patients/21 specimens associated with little or no basophil infiltration (basophil-low group) and 17 patients/17 specimens associated with marked basophil infiltration (basophil-high group). The clinical characteristics of the patients (age, sex, complications, blood biomarkers, skin symptoms, and treatment) and histological features of the specimens were compared between the groups. Basophil-high patients were significantly younger than basophil-low patients. Blood basophil counts were higher in basophil-high patients than in basophil-low patients. CD4+ T-cell infiltration was more marked in basophil-high specimens than in basophil-low specimens. CD4+ T cells infiltrated into the dermis as well as into the epidermis only in the basophil-high specimens. Thus, basophil-high AD can be characterized by skin lesions associated with abundant helper T-cell infiltration in younger patients.