The International Journal of Romanian Society of Endocrinology / Registered in 1938

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July - September 2023, Volume 19, Issue 3
Case Report

Yilmaz GC, Anik A

Thyroid Dysfunction Caused by Maternal Autoimmune Thyroiditis: Two Different Clinical Pictures in Two Siblings

Acta Endo (Buc) 2023, 19 (3): 386-389
doi: 10.4183/aeb.2023.386

Objectives. Maternal antibodies in cases of chronic autoimmune thyroiditis may be transferred to the baby via the transplacental route, leading to transient hyperthyroidism or hypothyroidism. The development of hyperthyroidism in one sibling and hypothyroidism in the other, however, is an extremely rare condition. We present two siblings, one with transient neonatal hyperthyroidism and the other with transient neonatal hypothyroidism, born to a euthyroid mother who was being treated for Hashimoto's thyroiditis. Case Presentation. Case 1: A term male baby was evaluated due to tachycardia, high fT4 and low TSH. Following a diagnosis of Neonatal thyrotoxicosis, the patient was started on methimazole and propranolol treatments. The doses were gradually reduced and methimazole was stopped in the 5th month of treatment. Case 2: A male baby was referred with elevated TSH identified in the neonatal screening program, with TSH >100 mIU/L and fT4 7.5 pmol/l (N: 12-22) found in a venous blood sample. The patient was started on 50 μg/day LT4, which was gradually decreased and stopped when the baby was 5.5 months old. Conclusion. It should be kept in mind that antibodies may change character in mothers with autoimmune thyroiditis, and may cause different clinical pictures in babies in different pregnancies.

Keywords: maternal autoimmune thyroiditis, Neonatal thyrotoxicosis, transient neonatal hypothyroidism

Correspondence: Ahmet Anik MD, “Aydin Adnan” Menderes University, Faculty of Medicine, Department of Pediatric Endocrinology, Aydin, Turkiye, E-mail: