Abstract
Ectopic thyroid is a congenital defect in which the thyroid gland is located away from the usual pretracheal location. Dual ectopic thyroid, which consists of two foci of thyroid tissue, is very rare. In this case dual ectopic thyroid with subclinical hypothyroidism in a 10-year-old-girl was reported. The absence of the thyroid gland in the pretracheal location was revealed by ultrasonography (USG). Two foci of ectopic thyroid tissue located at the base of the tongue and infrahyoid region were determined by Technetium-99m pertechnetate thyroid scintigraphy. It can be concluded that if the thyroid gland is not visible by USG, ectopic thyroid tissue should be evaluated with scintigraphy.
Highlights
Ectopic thyroid is a developmental defect of the thyroid gland, in which the thyroid tissue is in a site other than the pretracheal location
A 10-year-old preadolescent girl incidentally presented with subclinical hypothyroidism
Thyroid function tests were in the normal range for free T3 and free T4 with elevated TSH of 32 IU/ml, compatible with subclinical hypothyroidism
Summary
Ectopic thyroid is a developmental defect of the thyroid gland, in which the thyroid tissue is in a site other than the pretracheal location. Ectopic thyroid tissues can be seen in many sites from the base of tongue through to the diaphragm [1]. Such a case with subclinical hypothyroidism is reported here. Ultrasonographic (USG) examination of the neck revealed the absence of a normally located thyroid gland (Figure 1).
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