Indian Journal of Nuclear Medicine
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CASE REPORT
Year : 2016  |  Volume : 31  |  Issue : 3  |  Page : 229-231

Intrathoracic toxic thyroid nodule causing hyperthyroidism with a multinodular normal functional cervical thyroid gland


1 Department of Nuclear Medicine, Cardiology Institute, Istanbul University, Istanbul, Turkey
2 Department of Nuclear Medicine, Corlu Public Hospital, Tekirdag, Turkey
3 Department of Nuclear Medicine, Haydarpasa Train and Research Hospital, Istanbul, Turkey
4 Department of Nuclear Medicine, Medical Faculty, Trakya University, Edirne, Turkey

Correspondence Address:
Burcu Dirlik Serim
Department of Nuclear Medicine, Cardiology Institute, Istanbul University, Istanbul
Turkey
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-3919.183617

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Radionuclide scintigraphy with I-131 and Tc-99m pertechnetate (99mTc04) has been widely used in detecting toxic nodules. Intrathoracic goiter usually presents as an anterior mediastinal mass. Mostly the connection between intrathoracic mass and the cervical thyroid gland is clearly and easily identified occurring as a result of inferior extension of thyroid tissue in the neck, which is called as secondary intrathoracic goiter. Completely separated, aberrant or in other words primary intrathoracic goiters arise as a result of abnormal embryologic migration of ectopic thyroid closely associated with aortic sac and descend into the mediastinum. Intrathoracic goiters are generally nontoxic nodules existing with mass effect without causing hyperthyroidism. However, mostly reported cases had enlarged thyroid glands in the neck. This report demonstrates the usefulness of I-131 and 99mTc04scintigraphy for detecting intrathoracic goiter causing hyperthyroidism with a normal functioned cervical thyroid gland.


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