الفهرس 
Embryology of the Thyroid GlandOnly 14 pages are availabe for public view
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Abstract
Introduction: An association between thyroid hormone and auditory function has long been recognized in patients with congenital hypothyroidism (CH). Research with laboratory animals has demonstrated that thyroid hormone plays a significant role in the maturation of inner ear structure.
Aim of the Work: To determine the rate of hearing dysfunction in children with congenital hypothyroidism. Also to determine its relation with factors such as congenital hypothyroidism severity and age at starting of treatment.
Patients and Methods: This study was conducted on 30 congenitally hypothyroid patients who were diagnosed by neonatal screening and treated with El-thyroxin, for whom Pure tone audiometry were performed to demonstrate the effect of CH on hearing. Results: there was 10% mild to moderate sensory neural hearing loss (SNHL) detected in the study group.
Conclusion: Sensory neural hearing loss is more common than conductive hearing loss in children with congenital hypothyroidism. Following up of hearing functions in children with congenital hypothyroidism is mandatory. Delayed diagnosis and loss of compliance to treatment contributes to the degree of hearing affection.