ESPE Abstracts

Background: The ability to concentrate iodide actively is a characteristic feature of the thyroid gland. This function is mediated through the sodium iodine symporter (NIS), a glycoprotein located in thyrocytes’membrane. Iodide transport defect (ITD) by NIS defects can result in hypothyroidism with variable degree of goiter and low to absent radio iodide uptake. Mutations in SLC5A5 gene encoding NIS are reported to be a rare form of dyshormonogenetic congenital hypothyroi...

Background: DICER1 is a member of the Ribonuclease III family that plays a crucial role in the biogenesis and the maturation of microRNAs. Pathogenic germline DICER1 variants cause a hereditary cancer predisposition syndrome with a variety of manifestations: in addition to first described pleuropulmonary blastoma (PPB) and ovarian sex cord-stromal tumours, individuals may also develop benign (multinodular goiter MNG, cystic nephroma\.) or malignant tumours as differen...

Background: The familial non-autoimmune hyperthyroidism (FNAH) is a hereditary disease caused by dominant activating mutations of the TSH receptor (TSHR) gene and rare in the paediatric population.Case presentation: A 20-month girl was referred for tachycardia. In personal history, she was delivered at 35 weeks of gestation by caesarean for fœtal tachycardia; she had been hospitalised at 1 and 5 months for diarrhoea and tachycardia was noticed. Clin...

Background: Congenital hypothyroidism (CH) is referred to dyshormonogenesis for 15 to 30%. Homozygous mutations associated have been demonstrated in DUOX2, TPO, TG, SLC5A5 (NIS), SLC26A4 (Pendred), DUOXA2, and IYD (DEHAL1) genes.Objective and hypotheses: Previous studies focusing on one or few thyroid-specific genes have proved not to be comprehensive enough for understanding physiopathological mechanisms of HC with dyshormonogenesis. Emerging diagnostic...

Background: Non functioning pituitary macro adenoma is rare during childhood. Therapeutic options are reduced to surgery and radiotherapy. Proton therapy is a particle therapy that uses a beam of protons to irradiate the tissue with the chief advantage that as a charged particle the dose is deposited over a narrow range and there is minimal exit dose.Objective and hypotheses: Proton therapy is largely used in France for paediatric craniopharyngiomas irra...

Background: Congenital hypothyroidism (CH) is the most frequent endocrine disease in infants with prevalence ratio in the range of 1:2000–1:4000 new-borns. The disorder can be permanent (CHP) or transient (CHT). CH can be classified into two main groups: Dysgenesis, which accounts classically for 80–85% of cases and dyshormonogenesis for remaining 15–20%. From the last decade, studies described a upward trend for CH prevalence and changes in groups’ proport...

Introduction: In Europe, GH is approved for short (height SDS <−2.5) children born small for gestational age (SGA) who fail to show catch-up growth by 4 years of age.Methods: This report analysed the patterns of GH dose used in everyday clinical practice based on short children born SGA enrolled in NordiNet® IOS, an observational study evaluating the long-term effectiveness and safety of Norditropin®. Average GH ...

Background: Mutations in the gene encoding LHX4, a homeodomain-containing factor with two LIM domains, are responsible for dominant hypopituitarisms with incomplete penetrance and variable expressivity. To date, only 14 unambiguous LHX4 mutations have been reported. Among those cases, 12 had an absent or ectopic posterior pituitary (EPP) and/or an abnormal sella turcica.Objective and hypotheses: To i) assess the contribution of LHX4 in combined pituitary...

Background: Acquired Von Willebrand's syndrome (aVWS) associated with hypothyroidism is rare in children and more often diagnosed during the peripubertal period in the context of Hashimoto's thyroiditis.Case presentation: A 5-year-old girl was referred to the paediatric haematology unit for rectal bleeding, anaemia, and prolonged activated partial thromboplastin time. Her developmental and learning skills were no...

Background: Pituitary stalk interruption syndrome (PSIS) is a frequent cause of congenital hypopituitarism. Patients are initially referred for the evaluation of hypoglycemia during the neonatal period or growth retardation during infancy or childhood. PSIS are either associated with extra-pituitary malformations (EPM+) or isolated (EPM−).Objective and hypotheses: To compare baseline characteristics, GH response, and long term evolution in patients...