International audienceExtensive numerical computations are often required to optimize the optical properties of nanostructures. Here, we use the Weierstrass factorization theorem to express the scattering matrix in terms of spectral singularities. We show that the location of poles and zeros of the scattering matrix fully determines all scattering properties, and that the scattering spectra of nanostructures can be decomposed into Lorentzian resonances over an arbitrary range of frequencies. This technique is applied to design nanoshell particles with enhanced absorption

During the course of this year, scientific research has revolved around coronavirus disease 2019 (COVID-19), with much uncertainty surrounding its pathogenesis, complications, and mortality as well as limited pediatric evidence. The exact relationship between COVID-19 and new-onset type 1 diabetes, especially in children, remains an unresolved issue. Our case exhibited a unique presentation of diabetic ketoacidosis (DKA) triggering COVID-19 diagnosis at this age. A three-year-old Moroccan boy was admitted with a history of acute dyspnea accompanied by vomiting and weight loss, leading to a diagnosis of DKA. However, evident respiratory distress signs did not disappear, even though glycemic levels were normalized and acidosis resolved. The boy subsequently tested positive for SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2), with specific biological and radiological findings. Our clinical case potentially augmented the global registry of COVID-19-related diabetes (CoviDiab project) cases and provides a basis for further studies that seek to elucidate the correlation between new-onset type 1 diabetes and SARS-CoV-2 in the pediatric population.

Adrenal cysts are a rare entity that is usually nonfunctional and asymptomatic. Their association with adrenal neoplasms was rarely described in the literature. We report a unique case of a 40 -year-old woman who was referred for evaluation of a left adrenal incidentaloma with subclinical Cushing’s syndrome. The tumor was suspicious for malignancy regarding computed tomography scan (CT scan) features. Therefore, a laparoscopic left partial adrenalectomy was performed. Pathology examination showed multilocular spaces lined by endothelial cells which are compatible with endothelial adrenal cyst, associated to an adrenocortical adenoma. We further discuss the management of adrenal cyst with review of the literature.

Pilomyxoid astrocytoma (PMA) is a freshly described figure of low-grade neoplasms encountered in early childhood. Nevertheless, its precise classification by the World Health Organization (WHO) is still debatable. Making an exact diagnosis relies on histological and immunohistochemical pathognomonic features with specific radiological findings. PMA behaves aggressively with a shorter progression-free survival, and its management is unfortunately still arguable. We describe a rare case of PMA involving the suprasellar region who displays symptoms consistent with diencephalic syndrome. The diagnosis was made by magnetic resonance imaging (MRI) focused on the hypothalamic-pituitary axis, and the patient underwent a subtotal tumor resection combined with chemotherapy. Diagnosis of brain tumors should be kept in mind in young children with generalized and severe unexplained loss of subcutaneous fat with failure to thrive after ruling out classical causes.

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UNSTRUCTURED Self-management for type 1 diabetes mellitus patients is a real challenge especially in a time of a spreading pandemic. “Ana wa Soukari” is a newly designed smartphone application for therapeutic education and insulin doses management. Our study evaluated the effectiveness of “Ana wa soukari” on clinical and biological outcomes of type 1 diabetes self-management. Our 3 months’ follow-up results: 62 patients were included in our study. The mean age of our patients was 15 6,41 years. Sex ratio M/F = 1,1. Mean diabetes duration was 4,9 4,3 years and 67,7% of patients had diabetes for less than 5 years. Mean HbA1c levels in Group A (with application) and Group B (without application) dropped from 8,3% 2,3 and 8,2% 2 respectively at baseline to 7,4% 1,5 and 8% 1,8 at three months’ follow-up. Change in hypoglycaemic episodes was – 1,8 2,0 (P < 0,001) for Group A and – 1,2 1,5 (P < 0,001) for Group B. DTSQs was performed in both groups at end point. Scores were significantly higher in group (A) than in group (B) with a mean score of 31,8 3,4 and 28,4 3,8 respectively (P < 0,001). Self-management smartphone apps appear to be effective on glycaemic control and should be considered as an adjuvant intervention to the standard diabetes care.