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Thyroid Nodule

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Thyroid Diseases

Part of the book series: Endocrinology ((ENDOCR))

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Abstract

Benign thyroid nodules are highly prevalent in iodine-deficient areas. Histologically, benign thyroid nodules are characterized by morphologic criteria as encapsulated lesions (true adenomas) or adenomatous nodules, which lack a capsule. On functional grounds, nodules are classified as either “cold,” “normal,” or “hot,” depending on whether they show decreased, normal, or increased uptake on scintiscan. Approximately 50–85% of all nodules are “cold,” up to 40% are scintigraphically indifferent and about 10% are “hot,” although the prevalence will vary geographically with the ambient iodine supply and with the clinical setting.

Hot thyroid nodules (autonomously functioning thyroid nodules, AFTNs) are mainly due to mutations which confer a constitutive activation of the cAMP cascade (e.g., TSHR and Gsα mutations) which results in a stimulation of growth and function. In contrast, the molecular etiology of cold thyroid nodules (CTNs) is still largely unknown.

Thyroid autonomy (i.e., AFTNs) is an almost exclusively benign disease, and there is little evidence in the literature to suggest the contrary. In contrast, the differential diagnosis of scintigraphically indifferent and CTNs includes benign follicular adenoma and adenomatous nodules, as well as papillary thyroid carcinoma and its variants and follicular thyroid carcinoma. While fine-needle aspiration cytology is currently the most sensitive and specific tool to select thyroid nodules for surgery after prioritization by assessment of ultrasound malignancy criteria, it is characterized by an inherent limitation, resulting in “indeterminate” cytologies. Molecular tests in the form of “rule out” and “rule in” malignancy tests have been proposed to fill this diagnostic gap.

The most important therapeutic options for hot nodules are radioiodine therapy or surgery and surgery for scintigraphically indifferent and CTNs if symptomatic or associated with increased malignancy risk.

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Eszlinger, M., Hegedüs, L., Paschke, R. (2018). Thyroid Nodule. In: Vitti, P., Hegedüs, L. (eds) Thyroid Diseases. Endocrinology. Springer, Cham. https://doi.org/10.1007/978-3-319-45013-1_6

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