What are thyroid adenomas?

Updated: Aug 19, 2020
  • Author: Daniel J Kelley, MD; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Thyroid adenomas are benign neoplasms, which are usually classified as follicular or papillary. Follicular adenomas are the most common type of adenomas and arise from the follicular epithelium within the thyroid gland. [4] They are typically homogeneous, solitary, and encapsulated tumors that are histologically distinct from adjacent thyroid tissue. Follicular adenomas are further classified according to their cellular architecture and relative amounts of cellularity and colloid into fetal (microfollicular), colloid (macrofollicular), embryonal (atypical), and Hürthle (oxyphil) cell types. Colloid adenomas do not have any potential for microinvasion, while the fetal, embryonal, and Hürthle cell adenomas all have the potential for microinvasion. Papillary adenomas are the least common type of thyroid adenoma.

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