Ectopic Thyroid on Scintigraphy
YK Chu
Hong Kong J Radiol 2018;21:143-9
DOI: 10.12809/hkjr1816884
Ectopic thyroid is a rare condition that involves aberrant embryogenesis of the thyroid primordium during its descent from the foramen caecum to its final pretracheal position. Ectopic thyroid tissue can be found around its route of migration, in the mediastinum and subdiaphragmatic areas. Histologically, ectopic thyroid resembles normal thyroid parenchyma. Preoperative recognition of the presence of ectopia is crucial for the surgeon when completing a thyroidectomy. Ectopic thyroid tissue left behind during total thyroidectomy may jeopardise treatment outcome and cause monitoring conflict. This article shares our nuclear findings that will aid awareness of ectopic thyroid tissue.
Author affiliation(s):
YK Chu: Department of Nuclear Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
中文摘要
異位甲狀腺核醫造影圖文回顧
朱任公
異位甲狀腺是臨床罕見的形式，在胚胎發育過程中，甲狀腺原基從盲孔下降到氣管前其最終位置，因下降誤導致組織異位；在遷徙路線周圍、縱膈腔及橫膈下區皆會出現異位甲狀腺。異位組織類似於正常的甲狀腺實質，而且通常沒有症狀，卻會影響甲狀腺切除術的成敗，外科醫生必須在手術前察覺異位症的存在；在全甲狀腺切除後遺留的甲狀腺異位組織，會危及治療效果，並導致術後監測困難。本文旨在分享異位甲狀腺的核醫造影表現，幫助臨床認知異位甲狀腺組織。