Trichothiodystrophy.

This case report describes an infant with frizzy, coarse, and fragile hair and low-set ears, blepharophimosis, and osteopenia.

Extramedullary hematopoiesis secondary to COVID-19: A first case report in a newborn.

A 39 weeks newborn baby was born with blueberry muffin macules and papules on her back. Skin biopsy was performed and showed extramedullary hematopoiesis. The mother who was infected by COVID-19 infection at 35 weeks of pregnancy did not have any other risk factor for extramedullary hematopoiesis, thus making this viral infection the most likely cause of blueberry muffin rash.

Pediatric Cutaneous Hematologic Disorders: Cutaneous Lymphoma and Leukemia Cutis-Experience of a Tertiary-Care Pediatric Institution and Review of the Literature.

BACKGROUND: Cutaneous hematologic malignancies are rare in children, and the literature about them is still sparse. OBJECTIVE: The purpose of our study was to report our experience with pediatric cases of cutaneous hematologic disorders and describe their clinical and histological features. METHODS: Data were retrospectively collected from the histopathologic database of the CHU Sainte-Justine, University of Montreal, Montreal, Canada. All patients up to 18 years of age with a diagnosis of a primary cutaneous lymphoma (including lymphomatoid papulosis), secondary cutaneous lymphoma or cutaneous manifestations of leukemia, followed from 1980 to 2019 at our center were reviewed. RESULTS: Thirty-six patients were included. Age at presentation ranged from birth to 18 years of age (mean 7.83 ± 5.16; median 7.0). Ten different hematologic disorders were identified according to the WHO-EORTC classifications: lymphomatoid papulosis (10 cases), mycosis fungoides (6 cases), anaplastic large cell lymphoma (4 cases), pre-B acute lymphoid leukemia (5 cases), primary cutaneous marginal zone B-cell lymphoma (4 cases), primary cutaneous CD4+medium T-cell lymphoproliferative disorder (1 case), extranodal NK/T-cell lymphoma (1 case), hydroa vacciniforme-like lymphoproliferative disorder (1 case), B-cell lymphoblastic lymphoma (1 case) and acute myeloid leukemia (3 cases). CONCLUSION: The most common subtype of cutaneous hematologic disease in our single institution study was lymphomatoid papulosis (type A and type C), followed by mycosis fungoides. Recognition of this large clinical and histological spectrum by dermatologists is important because diagnosis is often established by biopsy of skin lesions, even in secondary cutaneous cases. Moreover, the clinicopathological correlation is of utmost importance for the final diagnosis of those pathologies.

Linear cutaneous lupus erythematosus in children-report of two cases and review of the literature: A case report.

Linear cutaneous lupus erythematosus is an unusual presentation of cutaneous lupus following Blaschko's lines. It is described mostly in children and young adults and is usually not associated with systemic involvement. We report two cases of linear cutaneous lupus erythematosus in children who significantly improved after treatment with hydroxychloroquine in combination with topical corticosteroids and tacrolimus. These rare cases underline the importance of including linear cutaneous lupus erythematosus in the differential diagnosis of blaschkoid inflammatory lesions.

Kaposiform hemangioendothelioma with overlapping features of rapidly involuting congenital hemangioma and a delayed complication of necrotizing fasciitis.

We report the case of a male infant born at term with kaposiform hemangioendothelioma (KHE) of the right forearm and coagulopathy. Our case was unusual as it involuted leaving subcutaneous atrophy and prominent veins, which are more commonly observed in rapidly involuting congenital hemangioma. At 3 years of age, the child developed recurrent superficial thrombophlebitis localized to the area where the KHE had regressed. Subsequently, he developed necrotizing fasciitis and thrombotic veins in the same location and group A streptococcal septic shock.

A case of segmental stiff skin syndrome treated with systemic losartan.

Stiff skin syndrome (SSS) is a rare, autosomal dominant cutaneous disorder with progressive, symmetric, sclerotic skin changes of the shoulders, hips, and thighs. In a recent publication, a distinct segmental variant of SSS was proposed. In this report we discuss the case of a boy with segmental SSS and review the current literature.

A Novel PGM3 Mutation Is Associated With a Severe Phenotype of Bone Marrow Failure, Severe Combined Immunodeficiency, Skeletal Dysplasia, and Congenital Malformations.

Congenital disorders of glycosylation (CDGs) affect multiple systems and present a broad spectrum of clinical features, often including skeletal dysplasia. Exome sequencing has led to the identification of new CDG genes. Immune and skeletal phenotypes associated with mutations in PGM3, encoding a protein that converts N-acetyl-glucosamine-6-phosphate into N-acetyl-glucosamine-1-phosphate, were recently reported. Through exome sequencing, we identified a novel homozygous mutation (c.1135T>C; p.Phe379Leu) in PGM3 in two siblings with bone marrow failure, severe combined immunodeficiency, renal and intestinal malformations, and a skeletal dysplasia resembling Desbuquois dysplasia. Severe respiratory compromise secondary to lung hypoplasia and pulmonary hypertension, and intestinal obstruction led to their demise. We thus report the most severe phenotype described so far associated with PGM3 mutations. This CDG should be considered in the presence of skeletal dysplasia associated with severe immunodeficiency. © 2017 American Society for Bone and Mineral Research.

MFG-E8 Reprogramming of Macrophages Promotes Wound Healing by Increased bFGF Production and Fibroblast Functions.

Macrophages are essential for tissue repair. They have a crucial role in cutaneous wound healing, participating actively in the inflammation phase of the process. Unregulated macrophage activation may, however, represent a source of excessive inflammation, leading to abnormal wound healing and hypertrophic scars. Our research group has shown that apoptotic endothelial and epithelial cells secrete MFG-E8, which has the ability to reprogram macrophages from an M1 (proinflammatory) to an M2 (anti-inflammatory, pro-repair) phenotype. Hence, we tested whether modulation of macrophage reprogramming would promote tissue repair. Using a mouse model of wound healing, we showed that the presence and/or addition of MFG-E8 favors wound closure associated with an increase in CD206-positive cells and basic fibroblast growth factor production in healing tissues. More importantly, adoptive transfer of ex vivo MFG-E8-treated macrophages promoted wound closure. We also observed that MFG-E8-treated macrophages produced basic fibroblast growth factor that is responsible for fibroblast migration and proliferation. Taken together, our results strongly suggest that MFG-E8 plays a key role in macrophage reprogramming in tissue healing through induction of an anti-inflammatory M2 phenotype and basic fibroblast growth factor production, leading to fibroblast migration and wound closure.

Aortic Dilatation Associated With a De Novo Mutation in the SOX18 Gene: Expanding the Clinical Spectrum of Hypotrichosis-Lymphedema-Telangiectasia Syndrome.

BACKGROUND: We report a 13-year-old female patient followed since birth for multiple rare congenital defects, including hypotrichosis, telangiectasia, and severe dilatation of the ascending aorta. METHODS: Comprehensive phenotype assessment throughout childhood included repeated echocardiographic measurements, evaluation of renal function, and immunohistochemical analysis of skin biopsy samples. Whole-exome sequencing was performed for the patient and both unaffected parents. RESULTS: We identified a novel de novo mutation in the transcription factor SOX18 (c.481C>T:p.Gln161*) in the patient, which was absent in all unaffected family members. Echocardiography revealed early onset and progressive dilatation of the ascending aorta. Skin biopsy results confirmed the defects of the blood vasculature in the presence of intact lymphatic vessels. Assessment of renal function did not show any signs of renal problems or renal failure in the patient. CONCLUSIONS: The genetic finding of a pathogenic SOX18 mutation enabled the diagnosis of the rare hypotrichosis-lymphedema-telangiectasia syndrome in our patient. The identification of a novel stop gain mutation in the SOX18 gene in association with dilatation of the aorta highlights the importance of this gene during the development of the circulatory system. Our study highlights the importance of whole-exome sequencing in the rapid identification of genes and gene mutations involved in rare conditions and thus expanding the knowledge and spectrum of clinical manifestations associated with them.

Fatal Kawasaki disease with incomplete criteria: Correlation between optical coherence tomography and pathology.

Coronary artery aneurysm is a serious complication of Kawasaki disease (KD). A 3-month-old infant presented with severe KD 27 days after onset of fever. The patient presented with shock, inferolateral ischemia on electrocardiogram and high troponin. Echocardiography showed severe myocardial dysfunction with diffuse coronary dilation and right coronary artery aneurysm. Arterial Doppler demonstrated thrombosis of aneurysmal axillary and iliac arteries. Withdrawal of support was implemented due to multi-organ failure. Post-mortem optical coherence tomography correlated with pathology. The pulmonary artery was normal on OCT and histology. Coronary arteries showed aneurysmal dilatation, with intimal hyperplasia and preserved media on OCT. Pathology confirmed these findings, with destruction of the internal elastic lamina, luminal myofibroblastic proliferation, neovascularization, and partial disappearance of the media. This is the first report of pathologic correlation in KD with OCT at the subacute stage, which adequately identified structural wall changes.

Pigmented purpuric dermatosis: clinicopathologic characterization in a pediatric series.

Pigmentary purpuras (PPs) are a group of chronic disorders of unknown origin seldom described in children. With this study we sought to better characterize PP eruptions, including clinical evolution and management. A retrospective chart review from 2003 to 2013 querying characteristics of children with a biopsy-proven diagnosis of PP in the Centre Hospitalier Universitaire Ste-Justine dermatology clinic (Montreal, Quebec, Canada) was performed. Follow-up was obtained through telephone interviews. Descriptive statistical analysis was used. Of the 17 subjects, 8 were male and the mean age of onset was 9 years. PP was asymptomatic in 11 patients, pruritic in 3, and of cosmetic concern in 3. Schamberg's disease was the most frequent subtype in 12 cases. Resolution of PP was found in 13 cases with a median duration of less than 1 year (range 6 months-9 years). Five patients experienced spontaneous clearing without treatment, and improvement was observed in 75% of cases treated with topical corticosteroids and 100% with narrowband ultraviolet B (nbUVB). No associated disease, significant drug exposure, or contact allergens were found. Those findings support that PPs in children are idiopathic, chronic eruptions that can benefit from watchful waiting, although topical corticosteroids or nbUVB are may be useful if the patient or family desires faster resolution. This study was limited by its small size, its retrospective nature, and selection and recall bias.

Partially involuting congenital hemangiomas: a report of 8 cases and review of the literature.

BACKGROUND: Congenital hemangiomas have been divided into 2 major subtypes based on clinical behavior: rapidly involuting congenital hemangioma (RICH) and noninvoluting congenital hemangioma (NICH). OBJECTIVE: We describe a clinical subtype of congenital hemangioma that begins as a RICH but fails to completely involute and persists as a NICH-like lesion. We propose the term "partially involuting congenital hemangioma" for this lesion with overlapping features. METHODS: A review of the medical charts, serial clinical photographs, imaging, and biopsies performed on children with a diagnosis of partially involuting congenital hemangioma between 2001 and 2012 at Centre Hospitalier Universitaire Sainte-Justine pediatric dermatology/vascular anomalies clinic was performed. RESULTS: Eight full-term, healthy infants presented at birth with vascular lesions typical of RICH. Affected locations included the head and neck, trunk, or extremities. Size varied from 2.0 × 1.5 cm to 13.0 × 8.5 cm. All had rapid involution during the first 12 to 30 months of life before stabilizing in size and appearance. LIMITATIONS: Only a small number of cases were identified. CONCLUSION: Partially involuting congenital hemangiomas are congenital hemangiomas with a distinct behavior, evolving from RICH to persistent NICH-like lesions. Their recognition and study will help us better understand whether RICH and NICH are indeed separate entities or simply part of a spectrum.