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Goiter

Goiter is a topic covered in the 5-Minute Clinical Consult.

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Basics

Description

  • Any enlargement of the thyroid gland
  • Classification on the basis of
    • Location (cervical vs. substernal)
    • Morphology (diffuse vs. nodular)
    • Functional status (hypothyroid, euthyroid, or hyperthyroid)
    • Etiology (autoimmune, neoplastic, etc.)

Epidemiology

Prevalence

Varies according to dietary iodine

  • 5–7% in areas with iodine-replete diet
  • >20% in iodine-deficient areas

Etiology and Pathophysiology

  • Iodine deficiency is major cause worldwide.
  • Iodine excess
    • Japanese diets high in seaweed and fish
  • Certain drugs and foodstuffs
    • Lithium
    • Vegetables with thiocyanate metabolite
  • Heavy smoking (multinodular goiter)
  • Infiltration of gland
    • Inflammatory cells (thyroiditis)
    • Tumor cells (lymphoma, thyroid cancer)
  • TSH receptor activation
    • Autoimmune thyroiditis
    • Drugs
    • Pituitary adenoma
    • Thyroid hormone resistance
  • Genetics
  • Idiopathic

Genetics
  • Uncertain but suspected role in some cases
  • Familial predisposition
  • Occasional gene mutations affecting hormone synthesis

Risk Factors

  • Dietary iodine (deficient or excessive)
  • Heavy smoking
  • Family history
  • Female:male = 4:1

General Prevention

Adequate iodine intake

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Citation

Stephens, Mark B., et al., editors. "Goiter." 5-Minute Clinical Consult, 27th ed., Wolters Kluwer, 2019. Medicine Central, im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816440/all/Goiter.
Goiter. In: Stephens MB, Golding J, Baldor RA, et al, eds. 5-Minute Clinical Consult. 27th ed. Wolters Kluwer; 2019. https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816440/all/Goiter. Accessed April 24, 2019.
Goiter. (2019). In Stephens, M. B., Golding, J., Baldor, R. A., & Domino, F. J. (Eds.), 5-Minute Clinical Consult. Available from https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816440/all/Goiter
Goiter [Internet]. In: Stephens MB, Golding J, Baldor RA, Domino FJ, editors. 5-Minute Clinical Consult. Wolters Kluwer; 2019. [cited 2019 April 24]. Available from: https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816440/all/Goiter.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Goiter ID - 816440 ED - Stephens,Mark B, ED - Golding,Jeremy, ED - Baldor,Robert A, ED - Domino,Frank J, BT - 5-Minute Clinical Consult, Updating UR - https://im.unboundmedicine.com/medicine/view/5-Minute-Clinical-Consult/816440/all/Goiter PB - Wolters Kluwer ET - 27 DB - Medicine Central DP - Unbound Medicine ER -