Objective: Multisystem inflammatory syndrome in children (MIS-C), associated with Coronavirus disease-2019, is defined as the presence of documented fever, inflammation, and at least two signs of multisystem involvement and lack of an alternative microbial diagnosis in children who have recent or current Severe acute respiratory syndrome-Coronavirus-2 infection or exposure. In this study, we evaluated thyroid function tests in pediatric cases with MIS-C in order to understand how the hypothalamus-pituitary-thyroid axis was affected and to examine the relationship between disease severity and thyroid function. Methods: This case-control study was conducted between January 2021 and September 2021. The patient group consisted of 36 MIS-C cases, the control group included 72 healthy children. Demographic features, clinical findings, inflammatory markers, thyroid function tests, and thyroid antibody levels in cases of MIS-C were recorded. Thyroid function tests were recorded in the healthy control group. Results: When MIS-C and healthy control groups were compared, free triiodothyronine (fT3) level was lower in MIS-C cases, while free thyroxine (fT4) level was found to be lower in the healthy group (p<0.001, p=0.001, respectively). Although the fT4 level was significantly lower in controls, no significant difference was found compared with the age-appropriate reference intervals (p=0.318). When MIS-C cases were stratified by intensive care requirement, fT3 levels were also lower in those admitted to intensive care and also in those who received steroid treatment (p=0.043, p<0.001, respectively). Conclusion: Since the endocrine system critically coordinates and regulates important metabolic and biochemical pathways, investigation of endocrine function in MIS-C may be beneficial. These results show an association between low fT3 levels and both diagnosis of MIS-C and requirement for intensive care. Further studies are needed to predict the prognosis and develop a long-term follow-up management plan.

17β‐hydroxysteroid dehydrogenase type 3 deficiency is a rare cause of 46 XY disorders of sexual development. Mutations in the HSD17B3 gene result in reduced activity of the 17β‐HSD3 enzyme, decreasing the conversion of androstenedione to testosterone. In this report, two cases, admitted with different clinical findings in the neonatal and adolescent periods and were decided to be raised in different genders are presented. The first case who had complete female external genitalia presented on the third postnatal day with the complaint of swelling in the groin. He was decided to be raised as a male and was treated successfully with parenteral testosterone in order to increase phallus size before surgical correction of the external genitalia. The second case was an adolescent girl who presented due to pubertal virilisation and primary amenorrhoea and chose female gender. Molecular genetic analyses of the HSD17B3 gene revealed two different previously reported homozygous variants. We emphasise that patients with 17β‐hydroxysteroid dehydrogenase type 3 deficiency can present with heterogeneous clinical findings in different age groups. Early diagnosis is important to prevent future gender confusion and related problems.

Giriş: Şiddetli ve erken başlangıçlı obezitenin genetik nedenlerinde monogenik obezite formları önemli bir yer tutmaktadır. Bu çalışmada, kliniğimizde monogenik obezite ön tanısı ile takip edilen olguların klinik ve moleküler genetik analiz sonuçlarının değerlendirilmesi amaçlanmıştır. Gereç ve Yöntem: 2016-2018 yılları arasında kliniğimizde monogenik obezite ön tanısı ile moleküler genetik analiz yapılan olguların demografik, klinik ve biyokimyasal verileri geriye yönelik incelendi ve kaydedildi. Bulgular: Çalışmaya toplam 47 obez olgu (20 kız, 39 pubertal, ortalama yaş 14,3±3,2 yıl) alındı. Çalışmaya dahil edilen üç olguda MC4R'de patojenik varyant, bir olguda veri tabanında patojen varyant olarak kabul edilmeyen LEPR'de heterozigot varyant saptandı. MC4R geninde sekans varyantı sıklığı %6,4, LEPR geninde sekans varyantı sıklığı %2,1 olarak bulundu. Sonuç: Çalışmamızda monogenik obezite şüphesiyle tetkik edilen çocukların %8,5'inde (n=4) sekans varyantı saptandı. Bu olgularda obezite yaşamın ilk bir yılında gelişmişti ve ebeveynlerden en az birinde obezite mevcuttu. Bu nedenle, erken başlangıçlı obeziteye, ailesel obezite öyküsü eşlik ediyor ise ayırıcı tanıda öncelikle monogenik obezite formlarından olan MC4R defekti düşünülmelidir.

No abstract