Types
Almost all thyroid adenomas are follicular adenomas. Follicular adenomas can be described as "cold", "warm" or "hot" depending on their level of function. Histopathologically, follicular adenomas can be classified according to their cellular architecture and relative amounts of cellularity and colloid into the following types:
- Fetal (microfollicular) - these have the potential for microinvasion. These consist of small, closely packed follicles lined with epithelium.
- colloid (macrofollicular) - these do not have any potential for microinvasion
- embryonal (atypical) - have the potential for microinvasion.
- Hürthle (oxyphil) - have the potential for microinvasion.
Papillary adenomas are very rare.
Read more about this topic: Thyroid Adenoma
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