Related Experiment Videos
Etiologic study of primary congenital hypothyroidism
T Seeherunvong1, S Churesigaew
1Department of Medical Services, Children's Hospital, Bangkok, Thailand.
Journal of the Medical Association of Thailand = Chotmaihet Thangphaet
|September 16, 1998
Summary
Congenital hypothyroidism in children is most often caused by athyrosis (43%), thyroid hypoplasia (20%), or ectopic thyroid (33%). Early symptom onset can help distinguish lingual thyroid, a rare cause.
Area of Science:
- Pediatric Endocrinology
- Genetics and Developmental Biology
- Nuclear Medicine
Background:
- Congenital hypothyroidism (CH) is a common endocrine disorder in newborns.
- Primary CH necessitates lifelong thyroid hormone replacement therapy.
- Understanding the etiological spectrum of CH is crucial for timely diagnosis and management.
Purpose of the Study:
- To investigate the underlying causes of primary congenital hypothyroidism in a cohort of 35 children.
- To correlate clinical presentation and diagnostic findings with specific etiologies of CH.
Main Methods:
- Retrospective analysis of 35 children diagnosed with primary CH.
- Evaluation included serum T4 and TSH levels, 24-hour radioactive iodine uptake, and technetium-99m thyroid scintigraphy after hormone withdrawal.
- Clinical data, including age of symptom onset, were reviewed.
Main Results:
- Athyrosis was the most frequent cause (43%), followed by ectopic thyroid (33%) and thyroid hypoplasia (20%).
- One patient with an organification defect presented with an enlarged thyroid and positive perchlorate discharge test.
- Lower serum T4 levels (<2 µg/dL) were more prevalent in athyrosis and lingual thyroid groups compared to thyroid hypoplasia.
Conclusions:
- Athyrosis, ectopic thyroid, and hypoplasia are the predominant causes of primary CH in this cohort.
- Age of symptom onset may aid in differentiating lingual thyroid from other causes.
- Specific biochemical and imaging findings correlate with distinct etiological categories of CH.