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[Clinico-diagnostic characteristics of autoimmune thyroiditis in children]
Insights
Autoimmune thyroiditis in children often presents subtly, with a high risk during puberty. Early diagnosis is crucial, as tests like thyroid aspiration and immune complex detection are valuable, even if antibody levels are low.
Area of Science:
- Pediatric Endocrinology
- Immunology
- Thyroidology
Background:
- Autoimmune thyroiditis (AIT) is a significant endocrine disorder in children.
- Understanding the clinical presentation and diagnostic challenges of pediatric AIT is essential.
- Existing diagnostic methods require comparative assessment for accuracy in this age group.
Purpose of the Study:
- To delineate the clinical course of autoimmune thyroiditis in children.
- To comparatively assess diagnostic methods for autoimmune thyroiditis in pediatric patients.
- To identify reliable diagnostic markers for latent or evident hypothyroidism.
Main Methods:
- Clinical and laboratory examinations of 174 children (152 with AIT).
- Thyroliberin (TRH) stimulation testing in clinically euthyroid patients.
- Fine-needle aspiration biopsy (FNAB) with cytological analysis.
- Detection of circulating immune complexes (CIC).
- Measurement of antithyroid antibodies.
- Thyroid ultrasonography and scintigraphy.
Main Results:
- AIT presents insidiously with high risk in pre- and pubertal children, often lacking specific signs.
- Latent or overt hypothyroidism was prevalent in most patients, even when clinically euthyroid, identified via TRH testing.
- Thyroid FNAB with cytology and CIC detection (especially medium-sized) showed high diagnostic utility.
- Elevated antithyroid antibody titers are important, but their absence does not rule out AIT.
- Thyroid scanning aids in differentiating AIT from nodular goiter and neoplasms.
Conclusions:
- Pediatric autoimmune thyroiditis often follows a gradual course, with hypothyroidism developing progressively.
- Diagnostic approaches should integrate clinical evaluation, TRH testing, FNAB, and CIC analysis for comprehensive assessment.
- Relying solely on antibody titers can be misleading; a multi-faceted diagnostic strategy is recommended for accurate AIT diagnosis in children.
Abstract:
As many as 174 children (152 with autoimmune thyroiditis, 12 with thyroid diseases of non-autoimmune genesis and 10 with diffuse toxic goiter) underwent clinical and laboratory examinations with a purpose of delineating the clinical course and comparative assessments of the methods applied in the diagnosis of autoimmune thyroiditis. High risk for the disease in the pre- and pubertal age, the lack of a specific appearance, gradual disease development, uneventful course in many cases with a progressive development of hypothyrosis, and rare development of the grave patterns of hypothyrosis have been established. In clinically euthyroid conditions, the thyroliberin test revealed the predominance of latent or evident hypothyrosis in the majority of patients. Aspiration puncture of the thyroid accompanied by a cytological study of the punctate and detection of circulating immune complexes (increase of the content of medium-size circulating immune complexes) turned out to be of high diagnostic value. The measurement of the titer of antithyroid antibodies is of importance provided their level is high. Nevertheless the lack of antibodies does not allow one to exclude autoimmune thyroiditis. The scanning of the thyroid is of additional diagnostic significance, particularly in cases that require differentiation with nodular patterns of goiter and neoplasms.