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REVIEW ARTICLE
Year : 2020  |  Volume : 19  |  Issue : 4  |  Page : 336-340

Dual thyroid ectopia: A pictorial case series and review of literature


1 Department of Nuclear Medicine, All India Institute of Medical Sciences, Rishikesh, Uttrakhanad, India
2 Department of Nuclear Medicine, Sri Venkateshwara Institute of Medical Sciences, Tirupati, Andhra Pradesh, India

Correspondence Address:
Dr. Manishi L Narayan
Department of Nuclear Medicine, All India Institute of Medical Sciences, Rishikesh - 249 201, Uttrakhanad
India
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DOI: 10.4103/wjnm.WJNM_44_20

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Ectopic thyroid (ET) is a developmental anomaly of the thyroid gland with the presence of thyroid tissue at sites other than the normal cervical location anterior to second and third tracheal ring due to abnormal migration of the gland. It may be found along the path of descent of the developing thyroid primordium from the foramen caecum to the isthmus of the thyroid and up to the base of the diaphragm. Dual thyroid ectopia, where ET tissue is simultaneously present at two different abnormal locations, is a very rare developmental defect. Only a few cases have been reported worldwide. ET is predominantly seen in females and during puberty when the hormonal demand is high. Patients with ET may remain asymptomatic or present with swelling in the neck, symptoms such as dysphagia, dysphonia, dyspnea, and features of hypothyroidism. The diagnosis is usually made on clinical examination, laboratory tests, imaging studies, and cytology. Careful clinical evaluation is essential as ET may be the only functioning thyroid tissue. Thyroid scintigraphy is an important imaging tool and the gold standard for the diagnosis of ET tissue, as it has high sensitivity and specificity. Early and accurate diagnosis of ET is essential to start hormone replacement and avoid unnecessary surgery. The authors report here a series of four patients with dual ET tissue, diagnosed on thyroid scintigraphy.


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