Background: Vitiligo is the most common pigmentation-related disorder worldwide. An autoimmune etiology is widely considered, and genetic factors may play an important role in its pathogenesis. The purpose of this study was to assess the incidence of thyroid dysfunctions and autoimmune thyroiditis in children with vitiligo and to identify related factors.
Methods: Fifty children with vitiligo and 50 control children were enrolled. Data on age, onset, duration, disease activity, presence of thyroid disorder, other autoimmune diseases, halo nevi, poliosis, and mucosal vitiligo were determined. Serum free triiodothyronine, free thyroxine, total T3, total T4, thyroid-stimulating hormone, and antibodies to thyroperoxidase and thyroglobulin were measured. Thyroid gland efficiency was evaluated.
Results: The mean age at onset of vitiligo was 7.26 ± 4.43 years. The duration of vitiligo was 2.26 ± 2.95 years. Vulgaris-type vitiligo was the most common form in our patients (56%), and 42% reported at least one family member with thyroid disorder, autoimmune disease, or both. Overt hypothyroidism or hyperthyroidism were not detected. We found a significant association between autoimmune thyroiditis and both sex and disease duration (P = 0.046 and P = 0.07, respectively), but no association between autoimmune thyroiditis and age, age at onset of vitiligo, halo nevi, poliosis, mucosal involvement, disease activity, or family history of vitiligo, autoimmunity, or thyroid disorders.
Conclusions: Children with vitiligo show an increased incidence of autoimmune thyroiditis. Children with vitiligo, especially girls and subjects with generalized/vulgaris-type vitiligo, should be screened annually for thyroid function and antithyroid antibodies to assist in the early diagnosis and therapy of autoimmune thyroiditis.
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